Unless you play a tank meta (like LoL right now) when Tanks are so tanky that by the time and real DPS had done their entire kit 3 times over the Tank recovers health and just by mere small chip damage takes down the already small DPS health pool.

Granted, The MC function like a trap card, in that PVP if he wanted to battle with the intention of winning he would've tire the girl MP using all form of defence and movility and once he reach a proper state goes glass canon and one shot her. It's the first stage, if you know he can do that you'd be more weary, but 99% of his opponets will go thinking to down a tank, rather than a tank/berserker hybrid.

Also, isn't every time he levels up his Glass canon mode becomes even more ludricrous. By now a single of his hit's hurt like 3 times harder than his battle with the Sword Saint.