I think it's silly to call people who are upset about Final Fantasy XIII "Butthurt Playstation 3 fanboys".

Do you people realise that people bought Playstation 3's for this game? The reason they did that is because Square Enix has been saying for years that the game would only be avaible on the Playstation 3. So naturally some of the most diehard Square Enix fans went and spend 400$ ~ 600$ on the system only to hear....that the game would also be avaible on the Xbox360 after Square Enix said for years you MUST have a PS3 in order to play it. THAT is the problem right there.

The biggest issue here is that if you're a fan of Final Fantasy, chances are you're fan of the type of game Square Enix develops and publishes. So not only did many people bought a PS3 for nothing, they actually made a worse choice as Square Enix keeps Infinite Undiscovery, Star Ocean 4 exclusive to the 360, The Last Remnant a timed exclusive and rumors have it that Square Enix is hiring to develop even more games for the Xbox360.

so basicly Square said:
"Oh, you know that game that was supposed to be exclusive to your platform and was a very important part in your decision which console to buy? Yeah, we have changed our minds, we're going to publish it on that other console as well. Also, while we're at it, we're going to go ahead and release some other games exclusively on the other console as well, but you'll get Final Fantasy XIII versus in return which we promise will release this milenium....we think.No, we're not going to give you any info on the game yet, but here is a new CGI trailer for ya"

Square Enix can get away with making fake promises, and they can change their mind whenever they like. Those who bought a PS3 can't.

I personally am not very excited about the game as Square Enix is playing it's childish "we're not telling! we're not telling! nananana!" game, but I can understand why some PS3 Square Enix fans are pissed off.