There is no question in my mind that Bill Polian is one if not the greatest GM in NFL history. His Bills and Colts teams were dominant for almost an entire decade. However, I think his biggest flaw is his ability to pick a great coach. Levy was a great leader and kept the personalities of the Bills teams in check. However, he was not the best at constructing a gameplan and was often outcoached especially in the big game. Dungy was the same, they beat a weak Chicago team with QB that basically gave the game away. The Colts were again outcoached last night.
As great as Polian is at picking a talented roster, he doesnt seem to put enough stock in having the best coach. I admire his loyaly, but there is a good arguement that not having the stones to pull the trigger on a coach that doesnt maximize the players talent is Polian's biggest weakness.