It is important to remember that Mar-Vell or Marvel's strength levels were decreased as to promote new "captain marvel"'s right around the time of the MSH role playing game and the Marvel Universe handbook. This eveidenced in when he easily handles Iron Man, Sub Mariner, Thing, Hulk (toe to toe), and Thor. If ever there was an underrated character this is it.
Mar-Vell by far in terms of story, it's a shame Marvel doesn't back him more. The story is original, matter of fact, the funny thing is, that most people don't realize, they don't tell you on wiki etc., is that DC only rebought Shazam (after basically putting them out of business more or less for copyright infringement of supes) AFTER Marvel's Captain Marvel starting taking off, possibly giving Marvel their own avatar character. It's a fact look at the dates.
"Classic Cap" as you put it, already defeated SS. It's in the Starlin run as well as CM #2 (pre- powered) where SS did get the upper hand initially, but Mar-Vell eventually killed (or what seemed to be at the time) Super Skrull later.