I'm no fanboy but I've never wanted a game to be exclusive to one system. It only makes sense to produce a game for each of the available systems to broaden sales. This also makes it better for us consumers because the game will get price drops much sooner, in theory.
With the above being said, I'm especially glad PS3 is losing all its exclusive titles. This is not because I hate Sony. I have a PS1 and a PS2. The reason is Sony's price has moved it out of my reach. Even if it had a sudden $150 price drop, I, like many gamers, couldn't afford to pay $450 for it. Like many gamers, I want a game console to play games, nothing more and that is why I'm fine with my 360.
By the way, I don't remember seing any hate posts when Bethesda put Oblivion on PS3. Now everyone, except Wii users, can enjoy it.