I'd say it was a good anime, because it makes fun of the dragonball style bs where the main dude just gets more and more powerful with more and more ridiculous hair. In one punch man dude starts out invincible, and bald. His quest isn't too become THE BEST LIKE NOONE EVER WAS or THE PIRATE KING or STRONG ENOUGH TO CATCH THE DRAGONBALLS. It's the same as the quest the everyday man has, to live one day at a time and just fuck it do what I can, maybe become rich and famous if possible thats it. It's excellent in portraying that while mocking those other animes.
it's fun, unique and the animation is outstanding. the fighting scenes are sex
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great opening too