Is Portal 2 a slap in the face to 360 and PC users?

Portal 2 was released today and boy did it hit with a bang. PC and especially 360 users may not be so happy though. Despite phenomenal critical acclaim, some PC gamers have expressed their dissatisfaction by slamming Portal 2 on Metacritic, and one can't help to think that some 360 users might be feeling left out in the cold with sub-par graphics and no Steam in sight. – Attack of the Fanboy