Because I am tired of being burned by sony, a company i used to enjoy buying form. 3 ps2s, i never even played it that much in comparison to other consoles. the trying to put a root kit on my computer, (i use macs primarly so they failed), making movies i cant watch on my mac without informing me on the packaging. terrible defect rates on audio equipment after 2004. (still own an excelent sony receiver from 2001) tv failure, **refusal to honor warranty** with registration and original receipts.
MS... well they make a buggy os have terrible business practices, however, they have been very good at fostering game development on the pc, something they leveraged into the xbox line. when my 360 broke, guess what they sent me a box to get it fixed... wow amazing idea...
out side of service, the game selection is better, surprising amount of exclusive good games in the first two years (dead rising, crackdown, bioshock, mass effect), Better online experience .... im willing to pay if i enjoy it. enjoyed the new controller (is on the small side) i am a bit warry because of no hd on all units, a step backwards, and no user replaceable hd. the user replaceable hd thing i at least understand, most consumers would never do it. but please dont rip us off like you do for the 120, and 20 gig, long ago hd space went well below a dollar a gig.
also american media hates all video game systems equally. (the wii in their eyes is not a video game system). ps2,ps3, xbox, xbox 360, and pc, are all out to destroy americas youth. so sony gets as much love as ms does.
and from the general populace (people work with, friends, strangers who will banter about this stuff ) i get the feeling the ps3 has nothing special about it unless you want to watch blueray, and most people seem unimpressed by it, the 360 to have live, which peoples friends are on.