That's not true at all.
Did you already forgot about madden 30/60 FPS . I would say cod 4 was the first big Multiplatform game that finally didn't gimp ps3
actually it was pretty weird those first two years....but you're right Madden 08 was 60fps vs 30fps...and that is when a majority of muliplats tilted in the 360's favor.
however at launch the PS3 had quite a # of better multiplats though.
Madden 07 had two man tackling, better AF, more detail
NBA 2k7 was legit 1080p, where as the Xbox version was 720p
Marvel: Ultimate Alliance was legit 1080p
These 3 came out later than their Xbox counter parts, but looked MUCH better.
Full Auto 2- legit 1080p
Ridge Racer 7 - legit 1080p
Fight Night Round 3 - High resolution characters and MUCH better lighting.