Williams is virtually the same player in Cleveland that he was in Milwaukee. His shooting efficiency is somewhat better with the Cavs (although not much better) while his assists are down. In fact, the drop-off in assists appears to more than offset his improved shooting. Despite a small overall decline in Win Score, Mo Williams is suddenly an All-Star.
And this leads one to the obvious conclusion. To be an All-Star you simply need to score for a winning team. Last year Mo Williams scored some for a loser. And no one thought he was an All-Star. This year he gets to play with LeBron James -- and Wallace, Zydrunas Ilgauskas, Delonte West, and Anderson Varejao -- and suddenly Mo Williams is one of the very best players in the game.
As I have noted before, the purpose of statistics is to separate a player from his teammates. Mo Williams is essentially the same player he was in Milwaukee (and you don't need Win Score or Wins Produced to see this). So if he wasn't an All-Star last year, why is he going this year? For fans of the Rajon Rondo, Vince Carter, Andre Miller, Jose Calderon, Mike Bibby, Andre Iguodala, Caron Butler, Rodney Stuckey, and even Delonte West; the Mo Williams selection is truly a "shamockery".