He's proved to be clearly the best heavyweight in the world, which is how most people rate him. So no, he's not overrated in the slightest.
And lol at criticizing his boxing and footwork. Both very good by UFC standards, he's a former GG boxer and it shows. He generally wins by outboxing his opponents with ease, such as Werdum.
werdum has terrible boxing. outstriking him does not prove much.