system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel & DC] Which heroes/villains are combat underachievers, compared to what their powers allow?

I'm not talking about Reed Richards not curing cancer, or Superman not eradicating all crime on Earth. That stuff's hard, and maybe there's a good reason they haven't done it. 

I'm talking about good old fashioned beatdowns.

Some characters are, on paper, capable of extremely impressive feats. But we never get to see it. At best we get to see it once in a blue moon, before everyone again forgets that they can do this.

Everyone except that character's fans.

That character's fans, this is your time.
gpt
Plastic man. It's come up more recently, but the guy is incredibly powerful to the point that he's one of batman's biggest concerns in the super hero community. His flexibility makes him pretty much indestructible and he can expand to great sizes. He's been frozen, shattered into little pieces, and spread across the planet, but still was able to survive. he's also crazy enough to be completely unpredictable, which is batman's issue with him. He's overall a goofy guy, so he's not really a threat but his powers really exceed that of Mr Fantastic. Also, Barry Allen. Reverse Flash is able to cause people's atoms to explode by just touching them or age them into dust so flash must hold back a lot when he goes against his villains.