If no one gives a shit about +/- frags then why not remove it? If it's so meaningless that it is useless to everyone, why not get rid of the system altogether?
My biggest complaint about it is a + or - frag is it's not very telling at all. Someone could + frag a post because they agree with them on a majority of the points they make. They could + frag because they agreed with one point. They do it because they are friends with the guy. They could + frag because he's their favorite player.
Same goes for - frags, but it's even worse. You can minus frag because you had one bad experience with a player because he had a bad night. Maybe you - frag because you don't agree with his point of view, or because he's a "bad" player. It leads to a lot of confusion. A new player that gets - frags won't know why until someone actually bothers to post a reason. If you aren't willing to post something constructive, then it shouldn't be counted in any way.
If anything, +/- frags hurt the community more because you end up making assumptions about people or teams that may not even be complete truth. Add a polling system so you can get feedback on ideas, rather than up/down voting systems that are extremely vague and uninformative. Leave opinion topics to be based on the constructive feedback posted in a language that isn't ambiguous.