I think any option would work, but the problem here is I see this forum flooded with spam, and many alt users, so it can very easily misused no matter what the method is
But what would be the point of abusing it?
Oh, this guy has 100 likes for his crappy post? Wont mean anything and would be pointless to do. You could argue that the feedback system can be abused in the same way as well but it's just there as a guide and for people to make their own mind up much like this would be. A like doesn't translate to trustability or everyone else likes or agrees with his post.