Marvel has many non-superpowered heroes and villains, but it's not as noticeable as in DC mainly because they lack a leading Batman of sorts. Plus, Marvel I would say has more mid-level superpowered characters than peak humans or high-end powerhouses, whereas in DC it's much more high level in general when it's not peak human.
Anyways, here's a thread for Marvel's Badass Normals such as Hawkeye (Clint Barton and Kate Bishop), Punisher, Black Knight, Mockingbird (well, originally), Shang-Chi, Boomerang, Bullseye, Baron Zemo, Crossbones and so on. Post away!