If you're curious I posted a pretty detailed assessment of Ainge's draft performance a while back.
http://forums.celticsblog.com/index.php?topic=65996.msg1502948#msg1502948
In the event that you don't feel like reading, I'll quote the general approach from that post here, because it has some humor value given the argument you're making:
My approach here is pretty simple. Because Danny's draft position has varied over time, I think the best benchmark of his performance is how the guys he's chosen have done vs. the guys who were chosen right after the guys he picked.
I've argued this out before, but this is a more reasonable thing to do than to ask whether *any* player drafted after Danny's pick turned out to be better. (I call this the "Chandler Parsons Fallacy"). If you evaluate any GM this way he will look awful, because hindsight is 20/20.
Your evaluation method is poor, which makes your analysis useless.
Well now, that is one convincing logical argument. Talk about backing up your position with facts and analysis. How ever could I have been so misguided?
The facts/analysis are obvious. By restricting yourself the way you do, you ignore a host of issues (bad GMs surrounding Ainge, different needs, etc...
For example, teams A,C, and D all need a point guard in a deep year for point guards. Team B needs a center in a bad year for centers, and reaches for a guy who fails. Using your method, Teams A and C will get rewarded for even middling players, because B missed. So, under your method, A's pick could be a borderline NBA player, B's could be a bust, C's could be another borderline NBA player, and D's could be an all star, and your system would miss all of that for A and half of that for C.