Well that’s not what you said. Wildly overrated?! Ok. Whatever you say.
Wildly is probably too strong, but he's like many quarterbacks who are over-glorified due to a team's success beyond their actual performance.
Starr, Griese, Bradshaw, Simms, Stabler, McMahon ...lots of over-glorified QBs in the past
There were other quarterbacks just as good as Troy essentially, but weren't in as good of a situation. QBs like Bartkowski, Bert Jones, Grogan, Sipe, Hart, Ken Anderson.... even Stafford somewhat before he got to a much better situation. Stafford is truly an elite quarterback and always was. Romo was a notch below him.
Troy was really good, but nowhere near the class of Brady, Peyton, Montana, Tarkenton, Mahomes, Farve, Elway, Marino, and others.
Troy threw a couple routes incredibly well, but he wasn't moving in the pocket and dropping dime throws like other guys. He did play with poise in big games though, and he didn't screw it up when the team was awesome.