As someone who has been on-board with the MCU since practically Day 1 (with the release of Iron Man in 2008), I go into each new film (and now TV show) with enthusiasm and a willingness to enjoy each project for what they are, but afterwards, I dive deeper and become more discerning. I think the whole culture of reviews/critics/scores has tainted a lot of viewers'/fans' opinions on things and they go in expecting things to be one way and then are upset when they aren't delivered what they thought the product would be.
For the most part, as far as Phase 4 goes, I've enjoyed most of it, but I also do recognize there have been writing faults and issues for many projects, i.e., there are things that could have been done better. Black Widow just felt like it was "too little, too late"; Shang-Chi was fairly good but it suffered from 3rd-Act-Syndrome; Eternals would've been better as a more fleshed-out 6-episode series; Spider-Man was probably as close to MCU greatest as they could get, but I feel like a lot of that film is driven by nostalgia; Doctor Strange ITMOM has a great premise, but treats its characters poorly; and Thor LAT felt like it was too chopped up (from it's 4-hour cut) to be a truly coherent film.
The TV shows, IMO, fared a bit better in terms of consistency within each show - WandaVision was exploratory and unique, though it also suffered from 3rd-Act-Syndrome with its final episode; The Falcon & The Winter Soldier was definitely rewritten over the beginning of the pandemic and felt like it had a lot of its original story gutted or changed; Loki was probably one of the better written shows over-all, even with the exposition-filled final episode, though Majors' acting really helped sell it; What If? did what it set out to do, but each episode was hit-or-miss; Hawkeye was a fun action spectacle but it felt like some characters were under-written and under-utilized; Moon Knight has a great premise and some great execution but a few choices felt odd here and there; and Ms. Marvel, like Loki, is probably one of the better written Disney+ MCU shows so far, very good character acting from most of the cast, though the undercooked villains felt cliche.
But I understand why fans feel Phase 4 has felt less-than-stellar, between the amount of content and how mid-to-good that content has been. If there had been less content, spread out over more time, it wouldnt' feel as sub-par, especially following a mostly-great Phase 3 (where nearly everything from Civil War to Endgame felt fresh and fun and exciting).
Going forward, with 12 projects in Phase 5 (in just about a year and a half's time) and 11 projects in Phase 6 (in less than 14 months), they aren't slowing down anytime soon, or producing any less. Let's just hope the quality of the product improves as we head towards the finish line of this Multiverse Saga.
-Marc.