I don't hate Sony, I just don't like their style of games, which usually heavily stresses cinematics. I like maximum freedom and action in my game, not "enter corridor -> watch cutsene -> rinse and repeat" that many Sony games seem to adhere to. Call me ADD, but I simply do not possess the patience to sit through endless cutscenes. If you must use cutscenes to convey your story, I expect them to be limited in my games, and they'd better be damn interesting, or offer some sort of interactive or "chose your own adventure" type quality (Mass Effect, Dragon Age). Granted, Sony obviously isn't the only perpetrator of this but they seem to use it more than most developers. I never grew up with Sony games, so franchises like God of War, Jak and Dexter, Sly, etc don't hold any meaning for me. While Little Big Planet seems fun, it seems like a poor immitation of Mario.
I also felt Sony's arrogance in the mid 2000s was getting annoying and their launch price of $600 is still absurd to me (though in all fairness, Nintendo's current arrogance is approaching that level). I actually might have gone for a PS3 instead of a 360 if only Sony's machine wasn't so expensive. Of course now it's a good price, but at this point, I have all the gaming I need and have no need for a PS3, which still only has about 3 or 4 exclusive games I would even care about anyway.
Finally, what's with the shapes for button labels? Could never get use to that.. "Press triangle to shoot!" Just doesn't sound right :P