So far, the OS X AppStore couldn't be called 'wildly popular' since its inception on January this year. Regularly, I checked my installed apps for availability in the App Store, because it allows for such easy updating. Lo and behold, only fairly trivial apps are there, the following list is not available in the App Store:
Now I agree that stuff like a bittorrent client (Vuze) and a network sniffing tool (KisMAC) would probably be refused in the App Store. But all in all, the OS X App Store could be called a disappointment so far.
Note that the Opera browser (which contains a bittorrent client) is in the App Store.