Of course Sony's line-up is more varied, but that's pretty much by virtue of having a bigger line-up, I mean pretty much every year this gen had people proclaiming it as the year of the PS3 at the start because of the size of the line-up, rather than the actual quality. For example, I very much like Uncharted 3 and InFamous 2, but then there was also Killzone 3, Resistance 3, Motorstorm Apocalypse etc. etc. But how many of the games Sony release are truly great? Even UC 3 had a backlash of sorts. All I'm saying is Sony has a lot of filler games and a better line-up only on paper most of the time, when in the end both Microsoft's and Nintendo's best efforts usually surpass the best of Sony.
I'm only talking about the current gen, btw.