For a middle of the pack (salary wise) team, I have very little in the way of negative comments to say about ownership. Below is a clip of teams in and around the Dbacks in terms of team salary... With the exception of the Braves (who are always one the best talent evaluating teams in all of baseball), I think the Dbacks compare very well with regard to salary & wins/competitiveness...
Chicago Cubs $104,150,726
Baltimore $91,793,333
Milwaukee $91,003,366
Arizona $90,158,500
Atlanta $89,288,193
New York Mets $88,877,033
Seattle $84,295,952
Cleveland $82,517,300
Kansas City $80,491,725