Originally Posted by
JudicatorPrime
Mar-Vell wasn't that powerful, to be honest. You have to remember that back in the 70s Marvel writers operated under an "any given Sunday" rule, whereby one character could defeat another irrespective of their power thresholds. Let's not forget that characters like Drax and Gamorra, who were both far less powerful than Thanos, were perceived to be legitimate threats to the Mad Titan. We weren't in an OHOTMU world then, but we are now.
In terms of strength and durability, Carol did better Mar-Vell. Take away the Cosmic Awareness, Nega Bands, fighting skill and experience and she was perceived to be "on par" with him. But she was never shown to have any of the "latent psionic talents common to all humans" outside of her sixth or seventh sense (I forget which magnitude she possessed). I suppose there was still time for her to manifest those powers, but after Claremont remade her as Binary I think everyone pretty much left it at that. Then and now, most writers do not like to work with OP characters outside of the occasional story arc.
Carol was very much a pro-feminist character in the early days, but never forget that most writers interpret equivalency as meaning "comparable", and not necessarily "superior to." We see that to this very day. She-Hulk is not superior to Hulk. War Machine was not superior to Iron Man. Nova (Frankie Raye) was not superior to Firelord. Bill Foster's Giant Man was not superior to Hank Pym's version, even though he supposedly improved the interaction of the particles. Dr. Voodoo is not superior to Dr. Strange. Blue Marvel is not superior to Sentry, even though both were written to adapt a version of Superman to the Marvel landscape. Even the female Thor has yet to show all of the same feats as the male version. To be sure, there have been exceptions to the rule. The Goddess was easily more powerful than the then existing version of Adam Warlock. (He's the Living Tribunal now, so obviously has changed.)
When it comes to Carol, we can only speculate why she didn't get a bigger power boost back when she was first introduced. But my hope is that they'll eventually stop creating derivative characters altogether. It was cute when it was just Carol, Jennifer (She Hulk), Jessica (Spider Woman), Janet and Jocasta. But now that we have Kismet, Spider-Gwen, the new Quasar, and the various progeny versions of legacy characters running around, I think maybe I'm hoping in vain.