Okay, so I went and saw this last night and have been mostly thinking it over and processing it.
In terms of a grade I'd give it a flat-A. Part of me is kind of leaning towards an A- but this movie being the end of a saga that's spanned 22 movies over 11 years it deserves a good nod of respect for that achievement. It plays nicely as an end to the "original" MCU Avengers.
Anytime a movie dicks around with time-travel it obviously opens up a lot of questions and head scratching and this movie tries to get around that by flat-out saying you cannot change your own past and you only create divergent timelines. This "works" for the sake of the movie and the franchise in that it doesn't erase anything that's happened since the ending of Infinity War (that is anything that's happened in Shield or the Netflix series "the snap.")
The problem for me is that this sort of creates... Well, it creates a pretty damn bleak world even with everyone returning five years later. I mean, the world would be between decimated and moved on and now everyone just returns? We saw abandoned, desolate, city streets in ruins. I mean, the world is pretty damn fucked-up and it's hard to see how it could just go back to some level of "normal" once everyone returns. It's... Just a lot to grasp.
It sort of shadows Tony's line in the first Avengers movie, "we may not save the world but we can avenge it," but... Sheesh and Wow.
I know it'd been a... "cheaper" way to go but they should've just gone with the logic of them simply preventing Thanos' snap. I mean, if he can reverse time to undo SW killing Vision, or Dr. Strange can reset the time several times over to bargain with Dormammu and undo the destruction of the city, I'd think they could've done the same thing to stop Thanos and "the snap."
And... Gamora is still gone? That kind of makes things... Odder for GotG:3 (even if she's replaced by the "past" Gamora, that still greatly impacts the relationship and history between her and the rest of the GotG.)
I really liked the stuff between Tony and Nebula on the Benatar, there was just a certain sweetness to it given Nebula's past. I would've liked to have seen their interaction with one another come more "full circle" with them playing flick the paper football somehow playing into them working together in the final battle.
The "Back to the Future: Part 2" style of seeing the previous movies from different perspectives was fun, like them watching Starlord dancing in the cave, but them seeing him dancing and singing to the song without the benefit of hearing the music. (As "we" are able to.)
Touching ending with Cap going back in time and spending it with Peggy but.... MAN does that open a lot of questions when it comes to returning the stones and without their containers.
I mean the "easiest" thing to do was probably to put the Space Stone back in the SHIELD base in the 1970s, even though he didn't have the Tesseract, well easier than that was probably handing over the Time Stone to the Ancient One. even if it was no long in the Amulet.
But....
How did he "sneak" through Asgard to return both Mjolnir and the Aether/Reality "Stone?" .... Did he inject it back into Jane? Did he take the Soul Stone back to Vormir amd run into the Red Skull? What happens when you take the Soul Stone BACK? Do you get the sacrifice back?
Did he take the Power Stone back to Morag? The Mind Stone back to the aftermath of the Battle of New York? (and Hydra) I mean... there's a LOT of questions there when it comes to that journey as it just doesn't make any sense if thought about for even a couple seconds, but him returning the stones (and Mjolnir) just seemed mostly shrugged off.
As for The Great Controversial Scene of 2019?
I didn't even notice it. Didn't register to me, and when I heard/saw people talking about it afterwards I was just like... "Huh? People are triggered by a heroic shot of all the female characters lined up?"
Glad I'm not set-off by such things.
But, overall, great movie and highly enjoyed it worth the journey we've made.
I'm kind of glad Captain Marvel had such a small role in this movie, for no reason other than I haven't seen Captain Marvel yet (been pretty busy lately) and didn't want to have to "deal" with a character I wasn't familiar with.
Professor Hulk? Loved it. (Though it sort of also goes with the "yadda, yadda, yadda" way of story telling that's impacted this and the previous Avengers: Infinity War where it seems like a lot of things happen off-screen and we're just kind of told "yeah, this happened in the intervening time. Accept it." In Infinity War it was Thanos getting off his ass after 20 movies and finally collecting all of the stones himself in ONE movie, here it was Bruce and Hulk working out their "issues" they were having in Infinity War to now co-existing at the same time. Yeah, five years have passed, but it just seems like quite a bit to sort of just gloss over.
And there has to be SOME story behind the rat that "accidentally" reactivated the Quantum Tunnel to let Ant-Man out. That just seems way too contrived and... gimmicky for this movie series for that to not have been "something" controlled by some other force.
Captain America wielding Mjolnir? That was great to finally see after the tease in Ultron.
Tony with his daughter was precious and sweet to see.
That's what I got for now, just some random thoughts as I think over the movie.