Like really really fun. Like coming home from school and watching Sailor Moon fun. Like staying up late to watch DBZ on Toonami fun. Like waking up early on Saturday mornings to watch cartoons fun. I haven't had so much fun watching a show since I was a kid. That's why I love it, and if you've ever been one to be entertained by such things you'll love it too.
Basically, if you're looking for a serious plot, this isn't for you. The anime takes the plot of One punch man more seriously than the manga/webtoon but it's still all about the comedy and action.
Don't misunderstand, this isn't a throwaway gag story. There is an interesting plot underneath the gags and fights if you care to look. Lots of social commentary going on. But you can also just treat it as a comedy or action anime if that's what you want. Just give it a shot. It might not blow you away but you'll definitely have fun on the ride.
Small note: I mostly read manga and I generally prefer manga over anime. I haven't watched a lot of anime, but I've read hundreds of manga and the genres I'm open too is everything except harem, ecchi and hentai.
That being said, after watching this perfect adaptation of one of my favorite manga I'm motivated to give anime more attention from now on.
