Hai ! This will be my first review so that i'll be keeping this short. It is spoiler-free.
When i looked at the reviews of this anime,people were bashing it for having such an OVERPOWERED protagonist and being lack of epic fight scenes.
But the whole plot is that. I dont know why they didnt put 'psychology' in the tags but you're actually watching a stressful life of a overpowered guy who is having no joy whilst fighting with evil.
If you think this Anime has no action or nicely drawn&written fight scenes, you should see Genos bursting his ass while trying to beat his sensei or other rivals. The scenes and moves are literally amazing.
I shouldnt end this without mentioning the great soundtracks,One Punch Man is actually the only anime i've never skipped the opening.
In conclusion, if you want to see;
* Nicely drawn fight scenes, good animation.
* A comedy style that is spot on ( its best when you watch it with hillarious subtitles,so ask your friends to find the most suiting subs)
* An anime you wont even realize how fast it finished.
* A unique protagonist you have never seen before.
* Pretty good soundtracks that you'll soon find yourself singing it without intention.