Haha. You're talking to someone who has above a 4 K/D, don't lecture me on how to play the game. I can deal with a plumber but only because I'm more skilled than my opponents. The plumber is OP it's as simple as that.
If a below average player is able get the same scores as an above average player simply by playing a good class, chances are there are some balance changes that are needed. Take that same good class, put it in the hands of an above average character and they'll be able to wreck face.
In the plumber's case, it is a non-progression character; so there will generally be more of them around. Apply the above statement to the popularity of this character, you do the math.
