Here's my list:
10. Shang Chi: The Legend of the Ten Rings. This one expanded the MCU, gave us a very likeable new hero, Tony Leung as a deeply sympathetic villain, and Michelle Yeoh in a key supporting role.
10. (alternate) Spiderman: No Way Home. This and Shang Chi were easily the best of Marvel's post End Game movies. This one felt like it paid me off for my lifetime of fandom. I didn't love Garfield's take on Spiderman until this film.
9. The Avengers. It's so fun to go back and see how it all started. Loki is the perfect foil to bring these disparate personalities together (credit to Stan Lee and Jack Kirby for recognizing that 50 years earlier), and the scene where they finally come together is iconic for a reason.
8. Black Panther. Easily the most thought-provoking MCU film, and there's no doubt that Killmonger steals the movie despite how perfect Chadwick Boseman is in the lead role.
7. Captain America: Civil War. Set out the stakes for the Captain America/Iron Man rivalry that is the heart of the MCU (that ending!). Plus, that fight at the airport was a childhood fantasy booking come to the big screen. The article rightly refers to the much lauded introductions of Black Panther and Spiderman, but for me the show stealing moment came from the Giant Man's first appearance.
6. Spiderman: Homecoming. Again with the relatively low stakes, which is what I usually want in a Spiderman film. And the stakes might be local, but they are deeply felt. Keaton's Vulture might be my favourite MCU villain. Definitely shortlisted.
5. Iron Man. I agree with the article that the (relatively) lower level stakes are a feature, and Rob Downey Jr. is the best cast superhero in film history.
4. Avengers: Infinity War. The Russo brothers do a phenomal job of building the tension, making things bleaker and bleaker for our heroes yet teasing us with hope that they might find a way out. And then Thor arrives! Too late! What a gut punch.
3. Thor: Ragnarock. The follow-up film is too coco-bananas for me, but this one struck just the right note of humour and pathos.
2. Avengers: End Game. This is how you take stakes that are on a cosmic level but make them feel personal. Captain America, alone, facing down Thanos' army only for the cavalry to arrive is one of the great moments in American cinema. And it perfectly pays off the two arcs the built the MCU, with Steve Rogers finally learning that he deserves something for himself, and Tony Stark finally attaining true selflessness.
1. Guardians of the Galaxy. Well, I paid to see it five times in the cinema, so that pretty much answers the rewatchability question right there. For me, a near perfect blend of childhood wonder and interstellar heroics, with an emotional core of found family. My second favourite superhero film (after The Incredibles).