I do have too many to maintain but there is such a thing as them being "done". Projects don't have to be active to be useful, plus it's open-source, I'd rather keep them around for other people to fork/leverage/maintain than delete them to make way for new projects. The real problem are the subjective ones like Jade/Stylus where the scope is limitless and everyone has a different idea of what they should have.

Yeah, just take them with a grain of salt until you actually read the issues/pulls. Often it's silly things like "support coffeescript" etc haha, but otherwise that's a decent way to gauge a project