The series is a breath of fresh air for me. The plot is terrible but it works for me, lol. Just awesome characters and awesome fights but at the same time different from shows like DBZ.Good storytelling is crucial to every genre. There were no stakes, twists or new dynamics against Boros in my opinion. It all played out exactly how you thought it would going with the same single joke from the pilot of 'ok'.
Even with it's light tone, those final episodes DO take themselves seriously. Definitely more action than comedy but regardless it is frustrating in any genre to not have your characters ever grow or learn. The after credits of OPM & the final boss fight end literally at the starting point of the series. That's not good for any anime.
Awesome shout to Vagabond though. Now there's a manga.
Also, OPM fans- the alien mass that Metal Bat and everybody fights whilst Saitama is VS Boros.....does it have a name? I really liked it.