Some people make posts and other people make comments but there should be a balance between post and comments in the instance

I personally don't think that only commenting is a bad thing. Sure posts would be "better" content, but discussion is also a major part of what I find entertaining

I am bad at quality posts but better at comments. I'd say any way you can contribute is great. Communities require effort and reddit was as much about content from the comment section as it was the original posts.