I would advise no PC gamer to buy this anyway its a horrible game & badly made. I bought the 360 version on release & was lucky enough to sell it for little financial loss once I had completed it.
I can confirm AC1 on PC is superior in every possible way & AC2 features PS2 level gfx(yep I'm not kidding either).
Read my earlier post's on the subject they tell you pretty much all you need to know & are fair & accurate!
http://forums.overclockers.co.uk/showpost.php?p=15821482&postcount=9
http://forums.overclockers.co.uk/showpost.php?p=15680585&postcount=15
Check your eyeballs or settings. I played it on PS3 and it looks almost identical to AC1, maybe slightly better. Plus it has full day/night cycle, more variety, swimming, etc.
Not to mention that it is superior game to AC1 in every way. AC1 was more like tech demo, AC2 is the real game.
Dunno what you are smoking tbh.