I'm not mad at the bad guys, that's their role in the story.
I'm more annoyed at that mage that keeps clinging on him and forces himself into a party. I hate those kinds of characters, their only role is be nuisances
We have to remember the MC is an idiot and doesn't know his buffs/debuffs are OP. So in his eyes, the party is already strong, and he was just providing a "little" support. He doesn't know they're actually weak and we're being carried