The Stats: you have a 37.5% chance of landing at least a solid roleplayer between 25-30 in the draft.
http://82games.com/nbadraftpicks.htm. But instead, let's look at what the Mavericks have done in the draft.
http://www.basketball-reference.com/...DAL/draft.html. While the Mavs haven't really underperformed, they've really not done anything of real value in the draft since Don was still here.