Well I do have all the consoles. But for me the deciding factor wasn't just a few games. Some series are PS3 exclusive (Final Fantasy, Disgaea, Romance of the Three Kingdoms), and some of my favorite designers work for Sony (like Fumito Ueda, Naughty Dog Studios) Add to that Sony's new approach of aggressively pursuing to publish original and interesting indie games (Little Big Planet is an example of this) it's really a no brainer.

There are plenty of reasons to make you buy a PS3 or prefer it over other consoles. But I guess this is not the topic for it.