After finally managing to play a little EB, I wanted to give a bit of feedback.
Naturally I chose AS and played on the suggested H/M. Campaign difficulty was ok, however, as others have noted, battles were too easy with some units fleeing after barely fighting longer than a few seconds. Battles against FMs were better, however not as challenging as I'd hoped. I'll definitely go for H/H or H/VH next time around.
I tried a different approach than usually and basically conquered nothing for the first 100 turns except Gerrha. I thought that this would give me a greater challenge in the later game. That was true to a certain extent, however not as much as I'd hoped would be the case. When the Ptolemies finally started to get active in Asia Minor, they got quickly overrun by Pergamon.
I got dragged into wars with Takshila and Hayasdan due to a rebelling Pura and what I presume was a botched assassination Hay's part. The latter was also the reason I got into a war with Pergamon, however this time it was my assassin that triggered it.
While I'm on the subject of assassins, they were a major nuisance. On the one hand I liked it, because they were actually starting to influence my economy in a bad way. On the other hand, they usually struck where it made no sense at all. Ptolemai assassins targeting markets in Persia and Taksashila assassins destroying waystations in Minor Asia. I guess there's not much to be done about that. I've never lost a single FM to assassins, which was quite nice.
Loyalty was a non-issue in this campaign. Maybe it's because I groom my faction leader and heir, but I've not had a single stack rebel from me. It got to the point where I could easily ignore loyalty completely.
In general I feel that traits and ancillaries is an area that needs expansion. Most characters get the same +-5 traits which don't change that much during their life. Apparently, education can also be ignored for the most part. I still do it for RP purposes, but I don't feel that it has a significant effect at all.
While I'm on traits, the trait for spys that gives them +4 skill and LOS does not seem to trigger, since they always go straight from 3 to 5.
AI progress in general was ok. There are however still too few wars and those that exist were almost all triggered by rebellions. (KH-Getai, Rome-Boii, Carthage-Ptolemaioi)
Carthage especially was doing nothing for the majority of the campaign, but have recently started to expand.
Rome is slowly starting to go on a rampage in central Europe. 3-4 turns after the last screenshot, they had not only taken the remaining rebel settlements around them but 2 settlements from the Boii as well while besieging a third. This is despite me giving about 30k to Boii every round as well as stacking spies in nearly every Roman city north of the Alps. However, the only settlement I've so far managed to rebel was Syrakuse. It seems to easy for the AI (and IMO for the player as well) to hold settlements with close to 0 % of their own culture.
Related to that I think that the conversion rate of governors should be reduced. It is too easy for me to put an influental governor (which as AS is not that hard due to the positive effects of an appointment to the King's council) with a halfway decent garrison in a newly conquered town and I never have to worry about rebellions for the rest of the campaign. Most of the time I don't use colonies not for the conversion but rather the recruitment options they offer.
I would also suggest removing the happiness penalty offered by the native recruitment building. Add that to the fact that it already converts to another culture, I see close to zero incentives to actually build it, since the threat of war by my neighbours is close to zero.
This brings me to the biggest bore in this campaign, the Ptolemies. In every version and every campaign I've played in EB 2, I've yet to see an army of theirs cross the Nile. They occasionally use fleets attempting to conquer Cyprus back, but there was
never any army, no matter how small, that actually marched up from Egypt. Maybe others have different experiences, but this has been consistend over every version I've played so far.
Additionally, I've been getting a
of CTDs in the new version, which I haven't encountered before. At the beginning of the campaign only every 15 - 20 turns, but they are getting more and more frequent to the point that I'm now quitting the campaign because they are every second turn now.
It usually happens when clicking around on the campaign map and always crashes with the "Medieval 2 has encoutered an unspecified error..." message. I have my game installed out of the program files and in windowed mode and while that helped with loading times, it didn't do anything to help with the crashes. I could upload an error log, but from my (unqualified) look at it it doesn't seem very informative. Maybe it's just my computer, since I'm running the game on a quite
laptop where other games also crash. However never so often and as I've said before, the problem only started to occur with the new version.
I still had a blast playing the campaign though and want to thank every team member for his or her hard work.