For as slow as updating can be, there is a plus in that Sony don't restrict update sizes. There's been quite a few PSN and PS3 titles transformed by the ability to update them as often, and on as big a scale as the developers want.
MAG is a great example, that game is completely different from what it was at launch thanks to quite a few GB of patches
GT5 as well, all the updates for that have transformed it.
So as much as we may want to bitch about them, look at the good with the bad.
Quite a few multiplatform games run better on the 360, but you buy a PS3 for the exclusives, if all you cared about was FIFA and COD, you'd buy a 360.