I don't think it's really possible to completely separate the objective from the subjective in the analysis of any player. But the purely objective analysis of Al is that he ranges anywhere from good to very good -- at the cusp of all star caliber, not in that elite class of player. I doubt any scout or NBA exec would disagree with that assessment.
Subjectively, however, I don't think there are many players who are so divisive (at least here). But what's confounding is the hyperbole about what a 'bad' player he is. Al's weaknesses are blown so out of proportion that you'd think he should only get 10 minutes a night.
I don't care if Al gets dealt so long as it's a good deal, or any player for that matter, but I do take issue with the absurdity of Al hate. Part of me wishes he will get dealt just so the "play Favors/Sap/Kanter" crowd can see what that would look like. It wouldn't be pretty.