PS3 exclusives don't do it for me, and I don't own any bluray discs yet.
I like the Xbox 360, there's a lot of games I want to play on it (Gears of War, Halo 3, GTA IV) but am always afraid of the RROD. I haven't bought one yet as such.
I own a Wii, which is fun but doesn't really settle well with me like the older Nintendo consoles did. The motion sensor is fun but sometimes you just wanna sit down and play, not dance around like a madman.
So yeah, depends what you like. I recommend Xbox for some of the games, and Wii if you have heaps of friends to play with.