Where did you get this whole console equality business from? Square Enix have stated the PS3 version of FFXIII will not be compressed as it doesn't need to be. And if they really deleted some scenes because they didn't want to have to put it on a 4th 360 DVD then either that's a load of unconfirmed rumours or those scenes wern't important enough to keep. I mean LO on 360 came on 4 discs, it's not exactly a problem and one can install all them onto the hard drive and play it off one disc. I'm sure FFXIII will be optimised for 360 NXE install.
Also Tekken 6 wasn't dumbed down on PS3, it's videos were of higher uncompressed quality. In fact the 360 version had a higher res option unavailable to the PS3 so no equality there.
If you're boycotting because of hear say rather than actual hard facts than tough luck mate, you're gonna miss out on one hell of an experiance.
So what other games have you heard have been dumbed down on the PS3 because it has to keep parity to the 360? Did you know Infinity Ward's PS3 team was twice as big as the 360 one because they wanted to keep both versions of COD looking the same? (360 version still looked and ran better- this is a fact). And I say good on them.
