As long as its not an obvious munchkin character it'll probably be fine. Mutants are powerful, they can do many things and fighting is generally not a problem for them. The point is not to use enhanced strength to destroy a tank. It's that you are so strong, your strength is meaningless. The object isn't to destroy to tank but understanding the repercussions for doing so. Powerful characters actually force you to use characters to drive a story instead of just events.