The wars are good, there are plenty of them, but I think they need to be shortened a bit, otherwise things just bog down to a crawl pretty soon, and eventually neither side is doing any fighting but the computer still 'Refuses to Talk!!'
now, about the civs we should have. I think we should have 4 types of civs.
1:
starting civs (Indai, China, Egypt, probably Babylon or Sumeria)
2:
Then we should have major power spawns (Rome, Germany, America, the big ones who are in the game now.
3:
'Barbarian' civs or minor civs which are important but are ultimately intended to either fall or not have a major role, such as perhaps Israel, the Huns, the Celts.
4:
Reincarnation civs, and this is my suggestion for a swystem. Essentially, say Rome falls, completely, to barbarians in the year 560 A.D. every year after that Italy would have a chance to spawn in its place with applicable techs.
(I have an idea on how to dynamically give techs too. described below)
Obviously this requires a way aroundd the 18 civ limit, so will need the Warlords Expansion. But I think this is necessary, if anything just because in the end game the original civs have NO CHANCE whatsoever to keep up with the new ones because of hteir handicaps, and I think the only way around it is to either reincarnate them, or give htem ridiculous bonuses, and I never liked giving people bonuses. But some original civs are alive and well today, in some form or another, and still a considerable power; China, India.
Now then, Dynamic techs, given by an unbuildable building given to the capital of a spawned nation for five turns and five turns only. This building would give them all techs already learned by any three civs already in place, similar to the Great Library of civ 3 or the wonder that does that in civ 4 whose name I can't remember. The only problem with this is I can't remember if that needs the civ to have met the civs their getting techs from or not... This also might not work well for Greece since there are only even 3 civs (maybe 4 soon) alive when they spawn.
oh, here is proof that wars happen well:

also, I think this shows that a Korea could easily survive in the game:
... wait, scratch that, reverse it...
EDIT: Completely forgot, here's Bzantium:
http://forums.civfanatics.com/showthread.php?t=170776
Also Rhye, if you want I do know a bit about programming and have actually taken a class on C++ and Java programming, I could and would really really like to help with anything I can. If all else I can read over code and spot random little syntax errors and stuff like that. If you want I'll start taking a look at the interface code and try and work out a way to add a window for the congresses feature.