Monroe is already better than Brook Lopez. Wall definitely has great talent, but he strikes me as a guy who will never slow down enough to be truly effective with that talent. He has to limit his mistakes to be as good as he can be and he's shown little inclination in that direction so far, and there is almost no positive reinforcement in that area either as people are too "OMG, he is like so goood!!!" about him even now as he low % chucks and turns the ball over all the time. It's all on him. Monroe won't ever be a superstar, but there's very little doubt that he's a high % double double player for the next decade. That's damn valuable.