If you guys are going to criticize the trade, at least read the proposal first. It's not Jax straight up for Manu, like a few posters have said-- it's Jax and Anthony Randolph, who will very likely become a very good player in the next couple of years. I'm not in favor of this trade, but people get so eager to criticize in these forums that they don't even read the posts completely.
And there is one thing I think Jax could definitely do better than Manu: defend bigs like Dirk, David West, and Pau Gasol in the playoffs.