Exactly. Marvel benefited from a ten-year build up to the Infinity War / Endgame double (two movies which were very good), and also benefited from other well-received instalments towards the end of Phase 3, such as Spider-Man Homecoming, Ragnarok and Black Panther. But there were plenty of movies in the first three phases which hovered around the average mark - sometimes a bit better than mediocre and sometimes a bit worse. These included (IMO) The Incredible Hulk, Iron Man 2, Thor, Captain America, The Dark World, Ant-Man, Doctor Strange, Guardians Vol 2, Ant-Man and the Wasp, and Captain Marvel. It’s just that Phases 1-3 ended on such a high note that it set unrealistic expectations for Phase 4, 5 and 6.

I imagine that if they can build up to, and execute, Kang Dynasty / Secret Wars as well as they did Infinity War / Endgame, and not stuff up the introduction of the Fantastic Four (and the X-Men if that’s on the cards for Phase 4-6), people will mostly forget about the current wave of mediocre movies and TV shows, and remember the Multiverse Saga as fondly as they do the Infinity Saga.