My WD has 170kdps with 475% cd and 50cc. I feel that that's somewhat respectable. However, when I tried to farm in MP8, I couldn't really take down elites fast enough. I could survive but took way way too long. I got little frustrated so I went down to MP7 but still was not satisfied. so I went down to MP4 then I felt comfortable.
I know when I had my SNS/CM wiz at 170kds with 50cc, it was able to take up to MP7 somewhat easily.
so my point is that even avg sns/cm wiz is significantly better than high end WD. but I guess cost of building avg sns/cm wiz is about the same or higher than building a high end WD?
I can not speak for other classes, eg. Monk, Dh, Barb. but I think most of the classes can farm efficiently in MP0-2. But only SNS/CM wiz can shine in high MP's and Uber.