Hi Lydia1974,
I have XBox myself and I can tell you that Xbox is much much much better than the PS2. Sorry I can't tell much of the diferences with PS3 tho.
The graphic is great and the games are a lot better than the PS2 games. I've been playing the GTA IV and I can get stucked in my chair for the whole day.
One little bad thing about XBox is its wireless remote sucks up alot of battery juice.
By the way, do you actually own a Wii before?
Cheers and nice meeting you.
