LMAO.
1) Randle hasn't done too much against athletic defenders that are the same size as he is. He struggles when he can't bully his way through players, and he isn't going to bully his way through players in the NBA.
2) His wingspan is 6'11". Pretty much the only NBA PF's with wingspans at that length or smaller are athletic freaks (Blake Griffin) or very skilled players (Kevin Love). Randle is neither of those.
3) He's slow defensively, and he doesn't anticipate well. He'll get abused by any PF with any semblance of athleticism and a face-up game.
4) Zach Randolph is a terrible comparison, because Randolph has a wingspan of about 7'4-7'5. That makes a huge difference. We all know how much you love size…that's a difference of 4-5"…that's a lot. Plus Randolph is much more polished.
5) Randle is a darker skinned Tyler Hansbrough. They both generated at least 1/3 of their points in college from the FT line, and Hansbrough didn't get the calls in the NBA that he got in college. Average defenders who bullied defenses around, relying on the refs to help them out. Randle ain't all that great.