Great feature!
Three suggestions:
One, how about an Honorable Mentions day where each staff member gets to award a title that didn't make it into the top 30? This would help address those one-off titles that no one else played.
Two, similar to One, how about a day for notable import titles. For example, I'd nominate Last Window, IMHO, it's better than Hotel Dusk (which is saying a lot), but had I nominated it, there's no way it would have made it in the top 50.
Three, how about running a second feature where us normies get to send in our top 10 (5?) picks, the same formula is applied and you run it all over again - it'd be interesting to get a larger pool and would be neat to see how the general population's opinions match up with y'alls.*
And - I'm surprised that Nintendogs (with it's crazy sales figures) and Clubhouse Games (because it rocks) didn't get a mention...

*edit: Just sat down and flipped through my DS titles to determine what my top ten would be. Very hard to do. Two things of note:
6 of my top ten are on this list.
All ten of my top ten are first party titles (which could be because the majority of my games are first party).