Having expectations met or not seems like a weird way to influence scores as heavily as you did although maybe that's just me.
Ya I won't deny that that just doesn't work for some people, but it makes sense to me. it mostly influenced Avengers 1, AoU and Endgame I'd say.
To address some of the thing you mentioned specifically
Iron Man 1 vs Captain America 1 IM1 is a fine movie, don't get me wrong, and upon looking at my list a second time (it was copy/pasted from how I had initially rated them and sent to my friends who were wanting a ranking as I was doing it) it probably actually should be up under Avengers 1 in that above tier. It's a decent movie and certainly better than Endgame. It does feel a little too "brown people bad" though for my liking, but that is likely just personal preference. It FEELS like the first movie, if that makes sense. A bit juvenile. Moving it up brings it into the same tier as CA1, and honestly you could likely say the bottom 4 of that tier now (CA 1 thru IM1) are pretty easily interchangeable
Spiderman stuff - I found the first Spiderman to be a bit boring and the action felt really sloppy. The movement felt really artificial and I didn't think the CGI was all that great and it pulled me out of it. The first Raimi spiderman is a better looking Spiderman movie, it flows better, and for him as a character, that is really important to me. The second movie improved on that, hence more enjoyment. The case of these two movies though is top tier. Holland is the perfect casting choice for Spiderman.
Endgame - I honestly really didn't like this movie. It's higher placement is more a result of the movies below it being mostly bad movies instead of Endgame actually being good. The bottom tier for me is "these movies are bad" while the second last tier is "these movies are bad but has some kind of redeeming quality". (hence why I needed to move Iron Man 1, that description doesn't fit). This movie though, to me, was just a mess. The first hour is honestly dreadful, struggling to explore the strange and wonderful audacity of Infinity War's conclusion before just jumping right back into the mundane cycle of things. The cameo structure is really jarring and doesn't actually do anything other than elicit gasps from the audience as they cheer on the movie. Endgames first move is to figure out a solution to the end of Infinity War instead of actually grappling with the consequences of it. Instead of being a really interesting conclusion it ends up being warm fan service. After the awesomeness that was Infinity War, this just left a really poor taste in my mouth.
Age of Ultron - Honestly, I don't get the hate of this. The dialogue has some issues, but I honestly found the entire thing really captivating and refreshing. It was well paced, and was a great balance between soap opera and spectacle. The characters have personality that really help push forward the narrative of identity and responsibility as well as the ambiguity of power. I honestly felt like this was a really great movie and didn't get all the hate. Granted, I also think that The Last Jedi is the 2nd best Star Wars movie which a lot of people think is insane so maybe I just like things people don't normally like
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stop victory lapping around your desk, your chair has rollers, it's not even really exercise Currently Playing: Subnautica Below Zero