Just got this game yesterday. When I first played it, I thought the combats were unsatisfying relative to HOMM3 cos the units are so small, you don't get that "yeah kill 'im!! Go get em!" feeling hehe.
But I've realised this is counterbalanced by the far greater level of strategy available like heroes being able to fight directly in the battle.
Also I was a bit annoyed that it actually has fewer types of units than HOMM3 and you can't even get all the types of units in a castle at once cos for example building a Monk building means you can't recruit Crusaders in that castle!
Anyone else played it? Any opinions? Also, if anyone else has got it, they should join
http://www.toheroes.com/ 
and give me a game as soon as the multiplayer patch comes out.