I have to confess, even though I'm a bigger Marvel fan both with the comics and the movies, I actually enjoyed Superman more than FF. It was the complete opposite of what I'd been expecting since the movies were announced.
I have to admit, when they started talking about how much Lois was a punk rock fan I was a little shocked that they mentioned Mucus Membrane.
The singers who sang the song for movie also performed it live at Peacefest during SDCC.
I'm the opposite, a DC fan (except for a sting collecting the X titles) who really likes and appreciates most of the Marvel movies.
Fact is, up to Endgame at least, most of Marvel's films were just excellent. It was truly amazing what they pulled off, with solo films for their characters before bringing them together in Avengers. Yes, recently they've been accused of repetition and running the well dry, but, my gosh, just the consistency they had for so long is pretty amazing. The ironic thing is that Kevin Feige says that his prototype for all Marvel movies is Richard Donner's Superman.
In contrast, DC largely failed to start its own universe, first with the terrible Green Lantern movie (everything was wrong with that film) and then by having Zach Snyder usher in the DCEU with Superman and Batman v Superman. What we got was some films with very dour tones (Man of Steel, Batman v Superman, Black Adam, etc.), and a lot of projects that had B or C-level characters. Big characters were in movies that weren't that good and B and C-level characters (e.g. Blue Beetler and Birds of Prey), while doing well with critics didn't do well at the box office.
I think Marvel has just done great and they have a lot to be proud of. With Gunn's Superman, hopefully better days are ahead for DC.
For Marvel, I think they can very well get through this tough time. The FF movie sounds like a lot of fun (I have fond memories of reading FF as a kid, especially on summer vacations) and the X-men reboot should be great (I always loved the X-men, I think it's one of Marvel's best franchises, along with Spiderman). It sounds like they're heading into Secret Wars which will be something of a reset to their universe, right, so they can take that opportunity to recast Iron Man and Cap.