I read somewhere that flagging posts put a strain on the moderators, as they have spend extra time deciding if the flags are valid or not. Generally, we can either close questions, or downvote answers (as well as questions).
However, the thing is, we can't do that for comments. There sure are comments out there that are lousy enough, and the only remedy is to flag them,(which puts a strain on moderators, and I am repeating myself).
Would downvotes on comments help?