I don't base my enjoyment of a game off of the perspective. I like plenty of 2D and 3D games. I like 2.5D games, unlike Ian (Mischief Makers is one of my favorite games ever, and games like Viewtiful Joe and Kirby 64 were also quite fun; not sure what category Alien Hominid would go under, but it's good too). It depends wholly on the quality of the games, not how I look at them. I'd say my favorite games balance is just about equal in terms of 3D and 2D.
And while I know good 2D games are easier to make than good 3D games, I have a lot of trouble accepting this: I've played far more terrible 2D games than 3D games, simply because I've gotten smart enough to not play bad 3D games and 2D games are more accessible. The ratio of good to bad for my 2D/3D perception is out of whack.
Still, I rate them equally. It just depends on the game.