The console with the largest userbase will always get the greatest amount of shovelware, just as the biggest pile of shit always draws the most flies. These are companies only concerned with making a quick buck by selling to the least demanding, or most clueless, gamers. It's not something to boast of per se, but it is a general indicator of overall success.
The relevent question, I think, is not how many exclusives total, but how many exclusives would other consoles really like to have?
I think there's little doubt that MS and Sony would love to have games like Mario Galaxy and Smash Bros, but not so much WiiPlay. OTOH, I think it fair to say Nintendo would love to have titles like RE5 and GTA4, but probably not Lair. But who has the more of these exclusives than the other? That's too subjective a call to make at this point.
