Well, look at top players in mmos. Are they anything special? Not really, they just dedicate more time to the game and their class than others. All of them are just regular people behind the screen. This MC too. In the "other world" he just happened to be in the right place at the right time, and managed to rise to the top purely through that and dedication to beating the "final boss". That's the thing about your power being based on a game system. It doesn't require you to be special to rise to the top with it. Just luck, dedication, and time.
i dont mind him bein a lucky with no real ability guy - but compare to a bunch of other OP MC this one really is just like an extra if he was in any of those comics thats the isuse. really couldnt keep up with his narrative it was so dull
its ok for MC to be OP but if that OP isnt explained or used properly it will be dull and the MC is such case - it seems like hes just happens to be the strongest, there is nothin extraodinary about his mind, his ability or his charisma.