1. there are specific xbox games that will run on the xbox 360, not all
2. xbox 360 cannot run PC games
3. Ps2 and Xbox 360 are completely different. PS2 is comparable with the original Xbox. Xbox 360 is way ahead of PS2...PS2 came out in 2000, Xbox 360 in 2005. PS2 has cheaper games. The biggest selling point for the Xbox 360 is its fantastic online service called Xbox LIVE.
4. PS3 is expensive. visually, unless you own a 40"+ HDTV, there's no difference bwteen the Xbox 360 and PS3.
5. You may even consider the Nintendo Wii (it is somewhere between the Xbox 360 and PS2. Very innovative type if console..you should do some research on it.
You can get more info on all of that at
http://www.360indians.com/
peace