I would have to disagree on the overpowered part. We're not suppose to be the most powerful and we haven't been portrayed as such. The MC has always been a mixed bag, fighting wise. The dev did a good job of making us feel powerful but dragging us back down to hell when fights break out.
To put it in a better picture, here's the MC's wins and losses in order:
MC vs Thugs at the shop - MC wins
MC sparing with Michael - Michael
MC vs Ella - Ella easily
MC vs Kenny - MC wins
MC vs Klaus - Klaus wins easily
MC vs Danica - MC
MC(at home) vs Klaus and bodyguards - Klaus
MC and Alice vs Klaus - Klaus at first, Post Evolution MC wins
MC vs Minyak - MC
MC vs Jake(in prison) - Jake
MC vs Jake vs Deryl - deadlocked but the MC won in the end
MC vs Deryl - Deryl
As you can see, he's won 6 times but lost 6 times(technically 7, if you count Klaus beating him with Alice, pre evolution) There's obvious context to these fights but as you can see, he's not beating everyone he encounters and he's definitely not the strongest. There's a lot of people, and I really mean a lot, who could kill the MC and wipe him from existence easily.
Do we have the potential to eventually be overpowered? Sure but we're definitely near the bottom still and I don't think the Dev plans on changing that anytime soon.