PS3 VS XBOX360 Game Library Average Metacritic Scores thourgh the years...

[binary solo]

I believe that X360 has more top scoring games (85+?) but has a much longer tale of crapware (thanks in part to a larger Kinect library than PS3 has a Move library I suspect). Sony has a bigger proportion of middle ground of scores.

As most games on the 2 systems are multiplats, shared between them it's logical to assume the scores will be roughly equal, albeit for most multiplats MS has usually got the better score because of the fact the PS3 version is lower quality (with a few exceptions).

That's why if you want to know which systems give the more highly reviewed unique gaming experience you need to look at the absolute exclusives (i.e. not the console exclusives). Unfortunately there are so few of those on 360 aside from Kinect games, that the Kinect effect will skew the 360 meta average much lower than PS3 (because like Move games, Kinect games generally have meta scores on the low side. So it really requires the elimination of the Kinect and Move titles to give a reasonable comparison. But then, the number of absolute exclusives on 360 is considerably lower than PS3, which means the 360 sample size can potentially have outlier biasing of its meta score.

So, it's basically a pointless pissing contest.

You could maybe do a Wii/PS3 comparison because they both have a high number of exclusives. Unfortunately Wii, as the dominant console when it counted, and the new toy when all the buzz was happening, got the lion's share of exclusive crapware.

But what we do know about all the consoles is this:

PS3 500 games with a green score on meta critic
360 620 games with a green score
Wii 199 games with a green score

Conclusion: Each console has enough well reviewed games to satisfy the vast majority of gamers, though the Wii is noticeably lagging. Considering plenty of the 65-74 meta games are worth playing for many people. If review scores were a valid measure of game quality all 3 consoles are well served in good games. Among all those well reviewed games there's got to be at least 50 on each console that any given gamer will enjoy playing.