We need more Servants with NPs that sacrifice an ally. Their farming and nuking potential is insane when they get to use supports as ammo for a free plugsuit.
He is painfully overrated if you need to use 5 OP as fuck support servants then any unit can look amazing, specially against such an easy farming node. The reality is that if you try to use him, Gong's damage is really low, and unlike Arash or Habertrot you are left on the field with one less good unit and a very weak bronze caster with no NP who can't charge it. Just use Avicebron or Cu caster to farm assassins instead, besides the obvious arash and spartacus