This is an interesting Marvel movie. I saw it today and I definitely enjoyed it overall.
Mysterio is great in this movie, but the twist choice for him has a curious consequence: the first act of the film feels like it goes nowhere. I understand this is necessary setup for the twist reveal but is seems like wasted screen-time at points. The reveal during the long toast at the bar felt really cool but also partly goofy--not sure how that could be fixed though.
And this is just a personal preference, but I definitely would have gone more serious with the 5-year lapse and implications of "The Blip." However, that would not have suited the tone of this film or of the MCU Spider-Man series very well.
Once Mysterio is revealed as a villain, the film really kicks into gear. I loved the mind-bending illusion sequences; they had great effects and visuals. I also really liked how Mysterio's "powers" are based in technology (even if the tech is far-fetched). I have always admired how the early MCU movies were a bit more "realistic" in explaining where the superpowers of the characters come from, and I liked seeing that again here. The film becomes a lot more fun and I do think the twist choice was worth it, even if it made the first act seem slow.
I loved seeing J. K. Simmons back in the first credit scene but didn't stick around for the second. From what I read about it, though, it looks like I will have to watch Captain Marvel coming up to make sense of future MCU developments.
I think this is a quality movie, but I fear that if Marvel continues to make blockbusters at this level--good but with specific problems--it could hasten serious fatigue. I want to see Marvel continue to succeed and I would love to see more financially successful and critically successful entries in the future. Far From Home should be a hit but it's not outstanding in that critical sense that I would really value.
The other big thing about this movie is that, walking out of the theater, I didn't feel convinced that Marvel has a big new direction for the MCU after Endgame that will combat fatigue. But I don't think Far From Home is supposed to do that at all. I guess this is just an epilogue to Endgame, and it's a pretty good one at that. I recommend this movie and I think it is a slightly above-average entry into the MCU and a good follow up to Homecoming.