Troy was terrible in the beginning and awful at the end. He was good when he had the best roster, running game, and defense in the NFL, but not before or after. Troy did a terrific job as a facilitator of the offense, and he had a terrific arm with short and intermediate throws, but he was immobile and uncreative, and struggled with deep throws.
Tony had to outscore everybody to overcome the worst scoring defenses in NFL history in Dallas, and he rarely had a complete offense. In the end, he finally had an offensive line, but his body couldn't hold up anymore. He still played great when his body would allow him.
Put your pom-poms down and watch objectively.
Tony would have won 4 or 5 Super Bowls with those early 90s teams. Dak could have even won a couple. They were that good.