Lets be honest, exactly how many multiplat games are superior on the PS3 compared to the 360. I know from personal experience that you can barely count them on one hand and even then, it was very minor. Only the FFXIII on a graphical point but the gameplay were the same and none of the graphical issue would mean anything if you only played the 360 version.
Bayonetta is the same, if you never played the 360 version then the game played the same but you would not know it did not look as good as the 360 version unless someone told you.
When a game has framerate problems that effect gameplay. when the framerate problems cause the experience of the game to be lessen where issues happen and you die, then its a serious problem and should be marked for it.
I am not trying to justify IGN reviews but I can see them marking the game down more if there is a lot of studdering and framerate issues on the PS3 end and not on the 360 it probably should be marked down. One game not looking as good as another game really means nothing if you only play on one system. If this was the case there are plenty mult-plat games that looked better on the 360 and the PS3 was not marked down for that from any review.
