Pandapadawan:Every new game starts at the bottom of that list.
That's not true. I watched plenty of games start on that list higher than Bloc. The "most popular" algorithm, from my observations over the last month or so, is some sort of combination of sales+downloads (including trials)+release date. I'm guessing that they used the same system from XBLA where the can really spur more sales of new games by calling them more popular because they are recent, but unfortunately I feel that model is not only not fitting to community games, but is actually detrimental.