I personally like the cartoony look for Warcraft 3. It is a game after all and it shouldn't be always so competitive and serious. Making it look cartoony makes it less serious and more like a game. But it is all about personal opinion though, I know many people that would prefer warcraft 3 less colourful and more "dramatic" in a way. Same with starcraft 2.

Well, I love Starcraft, but Warcraft3 has a lot more history and is indepth. I am sure that starcraft 2 will have a great campaign though.