short answer yes,all past evidence points to the ps3 being inferior when it comes to multi platform games.
Really? Give some examples? Crysis 2 runs just as well on the PS3 as it does on the Xbox, Oblivion runs better on the PS3 and that was released on all 3, FO3, FO3NV runs about the same as it does on the Xbox infact some have stated it looks a little better on the PS3, so please give me some links and articles for this to be the case because I don't believe it, not in my experience anyhow and I have played alot of games on both.
Infact if this was ever the case that comes down to lazy developers not utilizing the PS3's architecture properly because they are lazy, it has NOTHING to do with the system itself, because the PS3 apparently is harder to develop for because of the way it is programmed they can't be bothered putting in the work. If you look at the PS3 exclusive games like Killzone 3, Uncharted 2+3, GT5 they actually look superior to Xbox exclusive games imo.