There are already a couple of (great) discussions going on related to comment tags, from different directions:
As I mentioned in a comment in the top one, I've disabled the ability to add/remove comment tags for now. They didn't have any actual, non-cosmetic functionality yet anyway, and they're being misused (not severely, but a bit) for various reasons and in various ways.
Obviously we can have lots of larger discussions about how to revamp the comment-tagging system significantly to make it better (and link it into the trust system and such, once that actually exists), but I'd like to try to talk about something more focused in this thread for the sake of expediency: are there any simple, minimal things that we could do to make comment-tagging "useful enough" to turn back on soon?
For example, maybe it would be enough for now to just drop or add some of the options, or make the comment tags non-anonymous so that we can see who added particular tags. I'm not saying we definitely should do those, because it very well might go wrong in other ways, but those are the types of ideas I'd like to talk about—relatively quick solutions that might address some of the misuse.