Here's a continuation of my Roman Campaign from above. I've come to the conclusion that playing on H/M in a campaign where I intend to take my time is a mistake. The extra income (5000 per turn, I believe) allows Greece to support an extra half to full stack of troops depending on the quality they are building.
My interventions in the 260-250 time period were interesting. I took Sveaby using the move_character cheat and immediately gave it to Germania. That unblocked the two stacks that were stuck next to Vicus Cimbri for a couple of years.
I also marched across the Peloponnese and exterminated Athens, Elis, and Corinth (fighting only one real battle along the way). I destroyed the military infrastructure in Elis and Corinth, but left Athens intact because Athenian Hoplites are fun to fight against. Doing this has slowed down Greek unit production. It also convinced the AI to actually build and send against me a couple of units of Spartan Hoplites.
After that, the force headed to Crimea. I took Olbia from the Greeks and two of the other Crimean settlements from the rebels. I gave each to Sarmatia. I then crushed a Pontic army that was heading towards Campus Alanni before heading back to Italia for retraining. Tiberius Iunius Brutus, the Praetor commanding that expedition leveraged the glory of it to become the first non-starting Consul I've had. He has since retired from active military services to govern and command the defenses of Apollonia. This is no sinecure, as it has been besieged twice since he took charge.
My army composition:
I've now standardized the Roman core of all of my armies. Each contains 2 generals (one commander and one assistant, hopefully a younger protégé, but sometimes a complete loser who needs a job). It also contains 2 each of Triarii, Principes, and Hastati.
Beyond that, the armies are all auxilia. I've chosen not to build the Italic units so far. I'll probably upgrade a barracks or two to build those at some point so that I can play with them some. In general terms, the rest of the army tends to be mostly heavy infantry, with 0-4 skirmishers, 4 missile units and 0-2 cavalry.
I'm currently fielding major forces with these Auxilia:
- 6 Etrurian Hoplites, 4 Gallic Slingers, 2 Gallic Noble Cavalry
- 4 Picene Hoplites, 4 Light Samnites, 4 Cretan Archers
- 2 Marsi Heavy Spears, 2 Heavy Samnites, 4 Light Samnites, 4 Balearic Slingers
- 2 Marsi Heavy Spears, 2 Heavy Samnites, 2 Light Samnites, 4 Cretan Archers, 2 Numidian Cavalry
- 6 Libyan Spearmen, 4 Balearic Slingers, 2 Numidian Cavalry (currently being retrained with level 2 equipment in Roma)
- 4 Picene Hoplites, 2 Cretan Archers, 2 Tarentine Cavalry (defending Apollonia)
Most of my other Marsi units have now become garrison or defensive troops. I found I like the Samnites better. The Light Samnite is a great heavy skirmisher. They have 4 AP javelins. Man to man, the fight roughly like a sword warband, which makes them a very solid flank attack unit. You don't want them to meet anything head-on for long, but they will rip up the flank or rear of a phalanx or hoplite formation very quickly.
My objectives to date:
- 280-270: Conquer all of Italy from Bononia to Rhegium.
- 270-260: Conquer Sicily, Corsica, Sardinia, and Melite
- 260-250: Conquer Cisalpine Gaul, Illyria, and Apollonia
- 250-240 (current): Conquer Carthage's starting position, Carthago Nova, and (optionally) the rest of the North African coast. The last is optional depending on whether I think I can hold it in the face of Numidian aggression along with my other fronts.
The map progression:
Some comments:
I decided to end Carthage because it is just too stupid to let live. I propped up Carthage with vast sums of money, both in direct payment and in bribing an army besieging Carthago. Now, with two of its home settlements besieged and Carthago herself threatened, Carthage sent 8 units to try to retake Melite. 
Here's the attack force which is going to take Carthago. It's the Roman I Field Army commanded by Nero Valerius Laevinus. He was the assistant to Tiberius Iunius Brutus on his legendary journey across Greece and up to Sarmatia.

That will serve as my bridgehead while further legions are brought to the African front. A newly formed legion whose auxilia core is Libyan Spearmen and Balearic Slingers is being properly equipped with high grade Roman arms. Another smaller defensive legion has been in Lilybaeum. It will move to Carthago to form the defensive reserve for Africa. There are 3 units of peltasts which stand watch along the coasts of Malta. I couldn't take dealing with the tiny naval invasions every few turns, so I applied some cheese and blocked the landing zones.
The front with Greece has provided a lot of fun defensive battles (note that this shows both the sieging force and the defenders at Apollonia):

The Greek armies have tended to be hoplite heavy, normally 12-15 hoplite units (including generals) and the rest peltasts or skirmisher cavalry, with the occasional Thracian Merc unit mixed in. Tribune Lucius Iunius Silanus blocks the northern pass with the Roman I Legion. Legate (soon to be Praetor) Gnaeus the Victor (he's adopted and I have no clue what his last name was) stands in the southern pass. Former Consul Tiberius Iunius Brutus commands Apollonia and will send the besieging forces to meet Pluto.
Beyond that, the Barbarian powers are growing nicely. Germania controls 9 territories. The Gauls control 7, down from a peak of 8 at the time I invaded Cisalpine Gaul. Iberia controls all of Iberia. The Britons control 3 territories and are besieging Remi. They are likely to succeed as I appear to have all of the Gallic forces tied up futilely assaulting Alpine passes. Thrace controls 8 territories, but would likely be a power to contend with had it finished absorbing the mines of Illyria. Instead, that wealth now flows into Roma. Sarmatia was stalled after it lost Olbia to a rebellion. I rectified that by giving them Crimea, but that was too late for them to hold onto Campus Scythii.
After I returned Nepte and Capsa to Numidian control, Carthage just wilted and died. It refused to defend itself, instead sending futile attack forces at Melite. Gades got sandwiched between Iberia and Numida, who look ready to clash over control of Tingi. Bactria is becoming a majro power by absorbing all of the gold mines in the far east. Parthia got screwed by Petra flipping to it early and has never recovered. Armenia is being devoured by Pontus, another major power in the making and Seleucia's only real ally. Even after losing most of its holdings in Asia Minor, Ptolemy has stayed strong. It has concentrated on the land border with Seleucia in the Levant, resulting in some titanic full stack clashes.
Roma grew to a Huge City relatively recently. I build the palace and then a Forge. Currently building is a Ludus Magna.
I had to put the brakes on Capua and Ancona. I stuck net +squalor generals in them to limit their growth to 0.5%. Ancona had hit 20,000 people because it had a FM with several +growth traits.
The Next Generation:
A grandson of Tiberius Iunius Brutus has just come of age. He is currently in Roma learning his craft. He's the most jaw-dropping natural general I have ever seen. I truly cannot believe that the RNG spit him out, but I guess it had to happen eventually given how much I've played the game.

I decided it was worth it to go out of my way and get him some good ancillaries rather than taking the luck of the draw. They were hand delivered to him by some of the old fogeys around Italia.
I'm resisting the temptation to deploy him now. As any other faction, he'd immediately replace an existing general. As it is, he'll get the full 4 years of Roman Education in the hopes that he'll pick up some of the good military traits. LogisticalSkill would just be a heavenly addition for him. I haven't decided yet whether he'll take over a veteran army or build his own from scratch.