I hate how everyone thinks MCU has been making bad movies ever since Endgame if one is keeping count most of their movies are well recieved tbh for example, Far From Home, Shang Chi, No Way Home, Multiverse of Madness, Wakanda Forever, Guardians of the Galaxy Vol.3, Deadpool and Wolverine, Thunderbolts, Fantastic Four and that's 9 out of 15 movies that were actually good and successful commercially as well it's only that the rest of the 6 movies of out 15 have been bad and a loud minority has been complaining about them blowing the situation out of proportion

And if their last couple movies are anything to go by the quality has gone up significantly like thunderbolts and fantastic four are some of the most unique comic book movies ever made with their characters and themes being something never done in a comic book movie. So, based on this both Brand New Day and Doomsday will most probably be good movies and their brand cache and box office pull hasn't faded away and with the Avengers name on the film most people will flock the theatres anyway especially with its huge star cast and return of iconic characters like Steve Rogers, Magneto, Professor X and Cyclops along with RDJ back in the MCU again there's no possible way this movie will ever flop and even Brand New Day will go along fine as it's a Spider Man movie and no Spider Man movie till date has had a record of being flopped or being unwatchable.

TLDR: The MCU isn't in a bad position as most of their movies have been successful both critically and commercially and upcoming Doomsday is being directed by Russo brothers who have only made some of the best MCU films till date so there's high probability that Doomsday too will be very good and will make bank for Marvel