The Steelers quarterback told TheFinsiders.com: "Mike is way more. It's to Mike's credit. Mike is really focused on becoming a better receiver. So he's focused on his route running.
"He's focused on running out-routes, and curl-routes, and in-routes and doing all the little things that's required to become a great wide receiver.
"That's why he, to me, is one of the best in the league, because he not only has that speed, he can run by anybody, but he can [run] routes and he can get open."
Wallace's contract makes him the third-highest paid wideout in the NFL.