Something must have happened we don't know about, because it was only several weeks ago Jamison was playing regularly. I can remember him having a big game and D'Antoni saying in the press conference he is going to use the guy. (I'll probably kill him but he says he can do it... or something like that, can't remember the exact quote.)
Jamison may or may not be bad, but I'm sure he hasn't gotten this bad in the last 3-4 weeks.
im sure lakers management is telling mike d to play gasol more. which in turn is leaving less minutes at the 4. combine that with the fact that mike D loves ron ron at the 4 and jamison cant guard 3s, that leaves few minutes, if any, for jamison to get burn.
Of course he sucks if all they have him doing is jacking up 3s. He's a post player and likes to get in the post and do those ugly shots that go in for some reason. He also can hit the mid, but all I saw when I watched him play on the Lakers was pass to Kobe or chuck 3s.