Id go Cap every time and easily, really. Caps shield can block a head charge, while Hammerhead cant take more than a shot or two (other than his head, which Cap wouldnt attack) in return.
I love single-feat overreactions. Usually B-listers are more susceptible to it. The main characters have too many showings to begin with.
An adamantium skeleton doesn't suddenly make him a ton more than he was. Better, sure, but still just a durable thug. Rhino should theoretically still be much more of a challenge, for example. It just means Parker was a dumbass for a fight. Cap for the majority.
Anyway, yeah, it's pretty much how every other story arc goes in all of comics. The hero hits them with half-powered attacks, or there's a surprise of some sort, and the hero loses or at least fails to apprehend the villain. Then in the final fight, the hero gets pissed, lets loose, and whups some tail.
If we went by first fights in a story arc, heroes would have probably a 15% win percentage.
__________________ Harry Callahan: Well, when an adult male is chasing a female with intent to commit rape, I shoot the bastard. That's my policy.
The Mayor: Intent? How did you establish that?
Harry Callahan: When a man is chasing a woman through an alley with a butcher's knife and a hard-on, I figure he isn't out collecting for the Red Cross!
Cap no problem-having an adamantium skeleton doesn't make HH a great threat all of a sudden. Him kicking Spiderman's ass after his upgrade was PIS. He hasn't got a Hf, so he ain't Wolverine