A bit of a random question, but would it be possible to publicly see and sort by number of addon downloads like the Chrome Extension Store? Seems like a useful metric to rank addons.
With the current system, it is easy to create alternate accounts or get friends to give your addon more publicity by just giving it a thumbs up.
In my opinion, the current system also favors larger, more complex but less accessible add-ons since those typically have a more passionate audience that would be willing to review it.
This means the smaller, more simplistic but still useful addons are often obscured.