I used to remember when there was an on going rivalry and fan boy war between the two series battling things out. However in the last few years I kind of feel the rivalry has died down or fans don't really care or get too tensed anymore about liking Marvel over DC or liking DC over Marvel. A few reasons to this change could be:
1. Saturated comic book content. There ware now so many movies and tv shows of Marvel and DC that it became too much to start comparing.
It has become more about a marvel show getting compared to another marvel show than a DC show. For example Wandavision vs Loki made more sense to compare in story than Wandavision vs Batwoman that are female led super-heroes tv series.
2. DC did not need a cinematic universe anymore while the MCU universe grew stale. Some comic fans wanted DC not to bother with a cinematic universe and go in a different direction. I feel this was the outcome of 2016 Captain America: Civil War and Dawn of Justice and the Whedon JL film that failed.
3. It became cool in Hollywood to hate comic book films and this could have bonded fans from both sides, who just want to defend a genre they like.
4. Some fans are all grown up and don't spend emotion on comic book arguments.
5. Debating something less saturated. It could be possible that some comic book fans have moved on to other genres like fantasy. Right now I am sure there will be more reddit threads of Ring of Power vs House of Dragon to The Batman vs Dr Strange: MOM in 2022
Either way, I am glad it is kind of over or no longer a big thing. Not too long ago in the early days of the DCEU, MCU fans always took happiness in talking about DCEU bad rotten tomatoes scores,, while saying MCU has never had a rotten movie.
In 2022 I hardly see Marvel or DC fans talking about rotten tomatoes or fans from both sides super invested in a potential film flop from the rival's side. Black Adam and Black Panther 2 are out in less than a month apart and it looks like comic book fans just want to have fun and are not pitting both against the other.
Exactly 10 years ago. The Avengers 2012 vs The Dark knight Rises thing was so bad the editors of rotten tomatoes had to shut down the site because Nolan/DC fans were threatening them after TDKR scores dropped below Avengers while marvel fans were quick to dismiss TDKR as not been as inventive as Avengers.
I don't see this kind of toxic behaviour anymore in the genre at large and it is a nice space now.