He was a good GM, no doubt.
But Bill Polian didn't draft Jim Kelly, Bruce Smith, Andre Reed, Darryl Talley, Frank Reich etc. Rumor has it, Marv was the one who picked Tasker off waivers.
Timing is everything, and Polian came into a crappy situation in Buffalo just as things began to look up. But I'll give him credit, his record in Buffalo makes him look like a genius compared to his time in Indy.