as a comic book fan I just hate when they make films based on books or heroes that don't even get the time of day on the pages they're based off. like the Eternals, or Iron Heart, etc. There were a couple of exceptions like Guardians of the Galaxy and maybe Shang-Chi but even then it's like "Why do I want to go see a movie about Shang-Chi when I can't recall the last comic book I read that he was in"
DC has the issue of over saturation of its characters and its properties PLUS reboots. Like you said it's been done to death with their shows. Gotham characters are a prime example of this. How many shows/movies/crap do I need to see of Batman characters without Batman or even the slightest mention of batman in them? The Gotham TV show, Joker, Clayface, etc, etc, etc Or lets do ANOTHER series of films about Batman from a different perspective and/or timeline. Or Superman. How many god damn versions of Superman are you going to tell? On this show Superman has kids, on this show he's teaming up with Flash and Green Arrow, on this show he's not superman yet but wink wink nudge nudge he's superman. Lets reboot Suicide Squad but keep like one character from the previous version and recast everyone else and really confuse people. AND THEN when it inevitably all shits the bed lets reboot the DCU YET AGAIN!