I don’t think mes is overpowered. Good players know how to counter it.
I think the real reason we keep seeing this specific question is because while mes is a cool idea, it’s built around the targeting system. The de-targeting, searching a sea of clones for the real player, trying to tab to them and failing, then letting go of camera control to click a moving player is overwhelming to someone new. I’ve been playing since launch and I still don’t enjoy fighting mes for this reason.