I honestly think the game is pretty good overall . I mean the story could've definitely used some more work, but I love the custom created character overall and the fighting and whatnot is rather enjoyable.
I would say though that I feel like it could use another fighting style type. Like since Bang seems interesting in taking the CC on as a disciple, there should be like some special missions that allow players to achieve a martial arts type. And like how Weapon Type A is Metal Bat but Weapon Type B is Atomic Samurai, it could have Martial Arts Type A as Bang and then Martial Arts Type B as Garou's, just to keep things interesting.
And I do definitely believe that we should be able to play more the special missions that were done to raise the social strength with the OPM characters, but that's just me. I would appreciate that though.
Overall though, I do like the game and if you do like OPM, I'd buy it. It'll definitely kill some time giving you something to do.