Look, I used to like Diogu watching him from afar--like many initially I had reservations about how his game would translate coming out of the draft, but I saw several games with the Warriors where he had absolute monster games--that 13-15 shooting game against Detroit three years ago for starters--and he's also shown an ability to get to the line as well. So I thought I had seen enough potential (albeit from three years ago) where if he really put his mind to it, he could become a solid scorer and rebounder--I mean, his PER in all four years in the league were around 15 despite limited playing time, so it's hard to attribute that to a fluke anymore. Also, he's also averaged around 20-10 per 48 minutes during the last three seasons as well. And he hits free throws. So I wouldn't really classify him as your typical scrub--he's only 25, he has shown more than just something in the league, and perhaps all he may need is just playing time.
And then you get to the flipside of the equation--end of the day you have to question his attitude and conditioning, because if he was as talented as the stats paint it, then he wouldn't be on his fourth team in three years. I think it's more the latter, but you have to wonder whether the stigma of being an undersized relatively unathletic groundbound PF who plays little defense is also holding him down. By the way, that Leon Powe comparison is wholly inaccurate--Leon Powe is extremely well chiseled and has more athleticism than it would seem, and can really get up there for putbacks. Diogu will just box out, stay on the floor and lowrim the shot. I mean, you can just see it--Powe's the master of offensive efficiency, piling up many games where he's hitting 6-9 or 4-6, etc from the floor, while Diogu really struggles with bigger, more athletic defenders. In fact the athleticism may be holding him down--if he was 6'8" and as athletic as Powe he may have gotten some playing time, but teams just shy away from unathletic undersized bigs, regardless of production.
I think he's actually quite talented, but I'm not sure we really need him; for starters, we're developing Hawes and Thompson at C and PF, so he'll probably never be a starter here unless something drastic happens. Also, do we really need another undersized, unathletic PF who plays no D? We have been plagued with a plethora of these prototypes the past several years, and it's getting to the point of annoyance. So while I think he has offensive talent at the very least, I think he's best suited for another team when all is said and done