So, you want to know what the exit polls say before entering the voting booth? I don't know, I think it's nicer that each person has to decide for themselves whether it's a good post without
relying on other people's opinions for their own. Not only that, but good posts deserve every vote they get.
If you know for sure a post is good, you should vote it up. Likewise, if you know for sure a post is bad, vote it down. If you aren't sure how good or bad it is, exactly, and you'd like to know its current reputation before casting your ballot, then you probably don't know enough to vote either way. I follow certain guidelines on voting, I don't know if anyone else does. Mine are (1) I vote if I understand enough to solidly agree or disagree, or (2) I don't vote. I doubt this is the prevailing strategy though.