Maybe you can rank by a combination of the total score and the number of comments. Or, if we want to get fancy, include the scores of the comments themselves,

Maybe you can rank by a combination of the total score and the number of comments. Or, if we want to get fancy, include the scores of the comments themselves, in addition to the number. A large number of comments doesn't necessarily imply higher quality; it could just be a bunch of tangential discussions were spawned.