I don't think Tommy is overrated, slightly or hugely. I mean, he was a 6th round pick, for Gaylord Focker's sake. Perhaps Adams indeed has big role within Belichickism, but in a QB-plagued league, there would be no Patriot Dynasty without Brady. In addition to possessing a great arm, Brady's the greatest field general since Spartacus. No doubt in my humble mind, Brady is the GOAT of pro pigskin.
Gotta asks: Do you think Bart Starr was overrated? I wasn't around during Starr's heydays, so I can't say whether or not he's overrated. But based on my reading of wiki, seems like Starr was a late round pick who excelled mainly b/c of the Lombardi system.