He's right about Moon, but wrong about Hump and Kapono.
Moon is the best perimeter defender we have, and we do better with him on the court than off it, as his +/- indicates. It's amazing to me that the people that criticize the +/- as just another useless stat are the same people that complain about Moon's rebounding rate (an even more useless stat). Of course, no one mentions that Moon's offense has improved considerably since last year. I like him, he's our glue guy.
Hump is good when he's playing high energy, and he can't do that for more than 15 minutes a game. That's why his PER is so good in limited minutes, and it's why he should keep playing limited minutes. The guy just isn't a starter.
Kapono doesn't shoot enough threes because he can't get himself open. It's really that simple. Other teams know all about Kapono, and play him accordingly. I can't remember the last time Kapono passed up an open look.