Playing as France I begin with a unit of Old Guard with no experience (I know you guys don't change the startpos). As Napoleon, I keep my trusted Old Guard with me through the first 20 battles, but the rate at which infantry gain experience seems really slow (compared to artillery and cavalry). By the time i can recruit young guard on 3 chevrons, my old guard only have 2 chevrons. Later in the game i can recruit old guard at 7 chevrons, i am almost there and i know that my trusty unit i have had from the start will be inferior to my newly recruited unit, despite being veterans of 50 battles.
1) I think infantry needs to gain experience faster.
2) With regards to the old guard, I would like to see a system whereby France cannot recruit these units at all and just start with a core of 4 of these units. The player would then have to keep this core of units alive through the whole campaign and vet them. If you lose this core of old guard it will really hurt the invincibility of Napoleon.
3) With a quicker rate of experience, it would make adding experience to newly recruited troops more logical. They would be better trained, but still not as good and your veteran troops.
4) The loss of an experienced army would be more of a disaster. At the moment there is a period mid-game where it is almost advantageous (experience wise) to disband and recruit again.
I think some of the bonuses experience gives could do with some tweaks. Some of the reload and accuracy rates on experienced units seem a little too much. Would accuracy change that much on what were fairly inaccurate weapons? Reload would increase, but would we ever see more than 4 or perhaps 5 shots per minute? Do the morale bonuses stack with the experience and the general - or are they capped (although morale wise - even the old guard break at 50% dead).
In summary, I know it may possibly hurt the AI, but as the player I would like to feel more attached to my troops.