Okay, let me explain. Here's what we're most lacking: a true floor general who looks to get players involved other than himself first, and a defender in the backcourt.
Here's what we already had: short scorers who are adequate passers, but not especially intuitive, and who are mediocre defenders at best.
Mo is the latter and not the former.
We need to decide what we're doing: are we really trying to compete? Then we need to shore up our deficiencies, especially defense.
Are we trying to tank? Then we need to play the young players so that they learn while we lose (the "play Kevin Durant at SG" method).
Mo Williams fits neither strategy. He fits the "let's just be good enough to crawl into the playoffs and fuck up our chance at a lottery pick" strategy. Meanwhile any minutes he plays will be taken away from CJ and Will Barton (and possibly Crabbe). Now, the latter might be a cause for cheering, but if he's on the roster, the only way he's going to improve is to get PT. Not only that, but he also takes away from Batum expanding his role and even from Aldridge getting the ball in a position to score, because, again, Mo is a shoot-first guy. Basically we didn't get the PG we need, we got ANOTHER tweener shooter. It reminds me of the Derek Anderson signing.