OPM's characters are pretty bland. Most of them have one or two character traits that are really exaggerated. This might sound like an inherent flaw, but i'll give OPM the benefit of the doubt. This show is supposed to be an action/comedy, and neither of those genres really require super detailed characters. That being said, There were only a few characters that I thought were likable, namely Saitama and Mumen Rider. A majority of the characters were really bland and didn't have anything to them besides a cool design or ability.
Now as I said earlier, One Punch Man is SUPPOSED to be an Action/comedy. However, it really exists in this weird limbo between being a satire of shounen anime and just being another generic shounen. The comedy doesn't work because the show takes itself way too seriously, but at the same time Saitama's ability to kill basically anything in one hit keeps One Punch Man from working as a shounen. There's no real tension in fights. Saitama always wins in the exact same way. As far as comedy goes, there are basically two types of jokes in One Punch man: Saitama behaving apathetically toward common shounen tropes, and Saitama killing seemingly overpowered enemies with one attack. This show is about six hours long. As you'd imagine, these jokes get old pretty quickly. As you'd expect from madhouse, the action sequences are really well animated, but as you'd expect from a show about a guy who can kill anything with one punch, the most impressive scenes are usually the ones where the main character is absent.
to sum things up:
PROS:
-High production value
-Action scenes are well animated
-Some earlier episodes are kinda funny
CONS:
-Jokes are repetitive and usually executed poorly
-Characters are bland
-Tone is inconsistant/doesn't fit the show's premise
-"One Punch" gimmick is thrown out in the last episode
Overall, all One Punch Man has to offer is a couple of decent jokes and some well-animated action scenes. I'd give it somewhere from a 5.5 to a 6 out of 10. I wouldn't say that it's a terrible show, but lets face it. If any studio besides madhouse had produced this series, it'd be the literal definition of average.
