Saw it last night. I don't know if it was as much of a film as some of the Marvel movies have been, it's just one big plot execution, but that's what it was built to be. It was about as good as it could possibly have been given what it was trying to do. I thought the three concurrent set pieces (Wakanda, Titan, and the weapons forge) were really managed well and kept a lot of moving pieces from spinning off in directions that were hard to follow. In say, the Last Jedi, I thought the same concept of different storylines was handled really poorly and didn't work very well, but it was handled perfectly here.
I thought the ending was well done, but the emotional impact was very minimal given that they wiped out characters that there's no way can be dead given their franchises. If they'd lost Iron Man, Hulk, Cap, etc. then there might be some real gut punch there.
I'm sure there was two approaches considered to end the Avengers cycle:
-Kill some of the original Avengers, they stay dead, and the "new" Avengers assemble to defeat Thanos in Pt II and form a reset Avengers for the future
- Keep the original Avengers alive so the original core is at the center of Pt II, and kill them in Pt. II
Either way is fine, but doing it the second way makes the "deaths" at the end of the movie kind of a joke...it's a cliffhanger, but everyone knows they're not dead.
Seems like Gamorah could be dead, but I think they've got to bring her back, considering future GOTG movies that she's the only female in the crew, and one of the more resonant female heroes in the Marvel universe, and half of one of the few romantic pairings that actually emotionally works in the MCU.
Very disappointed if Loki is really dead...possibly my favorite character in the MCU.
I liked the laughs, the action pieces didn't bore me as they usually do in the superhero movie climaxes, and the characters really have pretty good chemistry the way they put them together.
My main quibble with it was the CGI Thanos. I actually thought the character was surprisingly well developed for a Marvel villain, and "well acted", as much as you can say that. But I thought the CGI for Thanos was really kind of weak and distracting, and it was pretty distracting when he was interacting with real actors like Gamorrah. I would have much rather seen them go makeup and prosthetic approach and let him be real, and then maybe play with his size like they did with Dinklage. I just don't see any compelling reason they really had to go full CGI for that character.
I'm assuming that the next one will be all about capturing the gauntlet to reverse time to bring everyone back, and it will include all the original Avengers + Captain Marvel. I'm going to guess we'll find out Hawkeye lost his family, so he'll be back.
One thing I'm curious about is where the Ant Man movies is going to fit chronologically. Normally the MCU movies don't seem to run out of sequence, although I know Capatain Marvel will be an origin story like Captain America was. So I wonder if Ant Man is going to take place in a post-Thanos universe, which seems to not mesh with the semi-comedic tone of the Ant Man movie. I'm going to guess it runs pretty well concurrent with the events of Infinity War, and maybe the post credit sequence is one of them turning to dust.