I agree with rimrook completely.
At the moment the PS3 is struggling to keep up. Not so many good games, overpriced, and problem with the reverse compatibility. But give it a year or so, and everything should be running smoothly.
360 beat everyone to the punch. They were release much earlier than all 3 systems. Thus giving it much more time to produce high-end games. It later on introduced reverse compatibility (at least that's what I was told).
The Wii. Alright, people are bragging about this one. Problem is, some people are REALLY stupid, and I don't even mean born with a defect. They don't wear the wristband thing, and are too violent with it, and end up breaking something, or hurting someone. But one problem is, Nintendo is known as much for the games lots of people crave nowadays. I seriously couldn't bring myself to get a Wii. I would rather play crappy-ass Half-Life mod then Super Mario "Wii Edition".
The 360 IS on top of it all, but the PS3 may have a promising future.