Not impressed with him. He lacks oomph on all his shots and his topspin backhand while solid, is hardly a deadly weapon and I do think it is too mechanical a shot i.e. he cannot improvise like Roger while he will face all the same struggles as one poster said. Also, he has not shown serious potential in the sense of winning big matches of any kind yet.
As for Tommy Haas, he was always a more offensive-minded player with all the shots, even if he is Federer-lite in every sense. He got to no.2 though. I doubt Dimitrov will ever get that high.