You have to remember that the writers and editors at Marvel have approached these topics with a degree of immaturity. The things you mentioned, but also turning Cyclops into a terrorist. While Bendis and later Lemire, were trying to ride the line between terrorist and "freedom fighter". Cyclops is an outright villain, and everyone hates his guts. Mockingbird , Ms Marvel (Kamala), Jane Thor + Angela (and their obvious feminist/SJW angle), the multiple relaunches of Carol Danvers' books since 2012 (to make her "happen" with audiences), Asian Hulk, Nazi Captain America and others.
Marvel has seen their sales decline in recent years, in a time when the MCU is the most popular franchise on the planet. People, especially long term fans weren't buying the books. And the people Marvel hoped would spend money on their books; the hipster, indie, counter culture crowd, weren't buying. Which led to a lot of cancellations and low sales. Marvel even hired a bunch of independent, Image and Valiant artists and writers to appeal to the aforementioned crowd, and no dice.
Meanwhile, DC's books have been doing great with fans and sales. Even though their movies aren't as liked as Marvel's. Then again, Marvel's books cost a dollar more, and Marvel would ship out more books than DC. Which would mean they were taking a loss for oversupplying retailers.
To be fair, I enjoyed Mockingbird a lot, and Totally Awesome Hulk is fairly decent (although the last few issues have been pretty weak). Captain Marvel has fluctuated, but I don't think "political" stuff has screwed with her books, mediocre writing did (like erasing all her memories for no reason, then basically pretending that didn't happen because they don't want to reset her personal relationships and they probably realized that was a bizarre, moronic idea).
I'll admit upfront that I'm not against comics dealing with political stuff, I don't support the idea that comics should stay out of that area. Mockingbird, for example, was a quality comic and deserved to last a lot longer. But, I think Marvel doesn't have a great track record with it, doing it poorly about half the time. A better writer could have made me not hate Jane Foster as Thor (especially if they had thought through the whole "Thor is unworthy" angle, and had realized that Thor is a name, not a title). Ms. Marvel I don't read, but its because I find her fan girl personality annoying, not because of political reasons. That book actually seems like the perfect place to bring up that stuff, since Ms. Marvel's race/religion is an integral part of that book from what I've seen. Captain America was just stupid. I barely count it as being political so much as just a horrible gimmick story. Cap has a history of being a patriot but calling the county out on its BS, he's even tossed his costume a few times because of that and it made for good stories. But Cap as a Nazi just felt like a stupid "shock" story, and really didn't need to be done.
Hawkeye and The Champions are just badly done, probably the worst of the "political" books. I'm not even necessarily against whatever issues they talk about (I only read a bit of Hawkeye and know Champions mpore by reputation and reviews), but they took to their topics with a sledgehammer and baseing a comic all on political stuff, instead of just using it as an element sometimes, was probably a bad move. Plus, Hawkeye had the disadvantage of becoming a cold blooded murderer, so its hard to make him a character someone wants to read about right now anyway.
In the end, I hope they don't mess with stuff like Ms. Marvel too much, and I'd like to still get stuff like Mockingbird. Nothing wrong with a feminist hero, and I find the idea that there is such a thing as an "sjw" angle ridiculous (along with the term itself). I just want that in addition to some good stories, and maybe ease up on some of the bizarre grimness that's infiltrated the Marvel books of the past few years (its a different type of grimness then DC had, but its gotten out of hand even though a lot of books are still good). A better balance is what Marvel needs, with a bit of a return to some brighter stories and heroes being heroes in all kinds of ways. Basically, they need to look at DC's Rebirth, but not necessarily copy it. They shouldn't avoid hard topics, but they don't need to make Cap a Nazi, take the X-Men from heroes to survivors on the brink of extinction or replace all the old Avengers to do that.
