re: Each Consoles Best Exclusives?

One important thing this graph doesn't take into account is timed exclusives. For a while there you could only get Braid, Limbo, Super Meat Boy and Mass Effect (just to name a few) on Xbox 360. 6 months to a year later and they're available on PC and PS3.

If this graph were more of a snapshot of specific periods in time it might look much different. As it stands now, though, there isn't much on 360 that you can't get elsewhere.