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
Saitama jumped off from the moon and back to Earth in seconds, surely he can make it to the neighboring city in less time than that. Neo-heroes can only get there faster if they were dispatched before the announcement