Considering that the PS2 still had exclusives as late as 2007 (God of War 2, its own versions Singstar & Buzz, etc.), I think that taking release rate, and quality-over-time is really much more important than "count".
The X360 was hotter than the PS2 in 2007 because it was just that -- hot. Upcoming. The awesomeness was getting released, all fresh and new, and it was good stuff, to boot. If you want to map a console's performance, in terms of exclusivity, you have to consider time and growth/recession, plain and simple. If you do not consider time and future potential, the PS2 was downright slaughtering the X360 right up through... well now, for many gamers. No contest, even. The PS3 would even count as the clear winner, with its PS1 BC, in this regard, for many. The PS1 had some phenominal game ratings... in the 90s. You cannot purchase a PS1 any longer, so BC is your only option for these fine games... many of which are easily obtainable.
If you ignore time, who cares about any console, but the PS2? It has a truckload of games rated well on metacritic... guess what those games would be rated now, if they came out on the 360 or PS3? Even the 2005 exclusives for the 360 are pathetic compared to just last year. Their metacritic rating is near meaningless -- heck many of the low scored ones were even criticized for looking too much like PS2 titles.
A simple snapshot tells no meaningful story, in this regard.