The textures and models were a little disapointing on the Xbox and the PS2, the textures on mostly all the enviroments were rather muddy and blurry, the textures on many of the characters faces were also pretty blurry and muddy, on the Ps2 I can forgive it for that, not alot they can do about that part of it.
but the Xbox version should have been able to handle more higher poly characters and slightly better textures.
The facial animation and modeling however is quite well done and the mobface (screen where you create your mobster in a similar way to the Sims 2) the animation is fluid and kinda creepy at times when the character looks out at you

I was impressed with the animations and facial detail for sure.
I've not first hand seen the PC version, but I expect the PC and 360 version will look alot nicer then the PS2 and Xbox.