I honestly believe Captain Marvel was the start of the downfall of Marvel. Not because of the cast, sex, or anything along those lines. I believe they over did the character. They made her way to damn strong which made all the other characters pointless. Remember when a literal god, the most advanced mech, and the super soldier with all the stats struggled with Thanos? Then Cpt Marvel swoops in destroys a couple of ships and takes one on the chin like nothing, that was the moment.

I don't understand this criticism at all.

First of all, it was Wanda who had Thanos almost beaten, which is why he had his ship fire on the ground. So Wanda presented a greater threat to him than Captain Marvel did; so great a threat that he was willing to sacrifice his entire army to try to take her out. I think it was Feige who said, around the time of Endgame or maybe shortly thereafter, that Wanda was the most powerful character in the MCU. But people don't criticise Wanda for being overpowered and making all the other characters pointless.

Second of all, while Danvers did take down one ship (not two, not that it makes a difference), they could have found ways for several other characters to do the same (eg Doctor Strange via illusions, Wanda or Thor through sheer power, Iron Man through nanotech magic) - they just wanted Captain Marvel to make a big entrance because she had been teased at the end of Infinity War (and then also in her own movie prior to Endgame), and we hadn't really seen her manifest her full power earlier in Endgame.

But the whole point of that her late intervention in the final fight was that Captain Marvel was NOT the overpowered deus ex machina that many fans falsely deride her to be. Because in a one-on-one fight with Thanos, Thanos disposes of her easily - they trade a few punches, he throws her into the ground. She comes back, and he punches her out of frame and out of the film (until the epilogue). The final fight came down to Captain America, Thor and of course Iron Man, which it was always going to - those being the three keystone Avengers of the MCU.

That's also why all the founding members of the Avengers went unsnapped at the end of Infinity War. Markus and McFeely and the Russos knew they were making an Avengers movie, not a Captain Marvel movie. Markus and McFeely knew that fans would have felt rightfully betrayed if a character, who had only been introduced to the MCU a year or so before, had swooped in and saved the day after a decade-long build up. So they made sure she didn't. But more fool them - they still cop the same criticism.

And I say all this as someone who thinks that both Captain Marvel movies (and most of Larson's performances in the MCU) have been decidedly mediocre, though not for any reasons related to her power level.