Being able to block users is a great option, one that I have to admit I don't use often enough.  But I would like to see an auto-block option, a filter of sorts, that would just eliminate any post that has certain specific terms.

I'd start with carebear, sandbox, themepark, and fail.

Do you have keywords that automatically tell you that the post is going to be worthless, so there's no need to even continue reading?