Liked it, with some rather major reservations

Rating: 5/10 (29 April 2019)

I liked it, but I did experience some disappointment.
******BEWARE: SPOILERS FOLLOW******
I know few, if any, in fiction have come up with any concrete rules for time travel but this film doesn't even try to define any rules; it only mentions the rules of a bunch of other movies about time travel had that, while they didn't make much sense, were at least there. This wasn't a case of using the Time Stone to go back in time, and selectively undo bad things, this was using quantum pseudo-physics where there logically should have been some sort of a ripple effect.
Maybe this was all explained and I just failed to grasp it but let me try to list all of the times where messing with the time-space continuum are simply ignored. The movie acts as if the only bad thing that could have happened (and did happen) was for Thanos to be alerted to the Avengers' goal of finding the stones and traveling to the future to get the stones. But, logically, a lot of other things probably should, or should not, have happened, maybe some of them bad. This movie doesn't even raise the question:
1. Loki steals the Tesseract in 2012, after a flubbed attempt by present-day (that is five years into the future) Stark, Rogers and Lang to retrieve it. Shouldn't this have caused a ripple in the time-space continuum? No, I guess not. Also, does this happen before or after Thor and Rocket go to Asgard 2013 to retrieve the Reality Stone and pass Loki's cell on the way. I'm honestly just asking.
2. Or does Stark and Rogers going back to 1970 and taking the Tesseract from that point prevent whatever Loki was supposed to have done with the Tesseract in 2012 from happening? If so, wouldn't it also have prevented other things from happening? For instance, Captain Marvel?
3. In 2013 Thor calls Mjolnir to him after talking to his soon-to-be-slain) mother. Um...uh...er...yeah... Forgive me for asking the obvious but wouldn't this leave the Thor of 2013 rather in the lurch and changed the course of events in *The Dark World*?
4. Shouldn't present-day Nebula killing her past self have ended her life too? No? Does time not work like that either, then? Okay, sure, whatever. Have it your way then, movie.
5. Shouldn't 2014-Thanos being snapped out of existence have undone all the people he killed, including Heimdall, Loki, Gamora and Vision?
6. I'm not sure what Cap did after dancing with Peggy Carter. Did he never get frozen? Did he just live his life normally with Peggy?
7. Not really a time-space thing, but more of a movie (il)logic thing, but just like in *Captain Marvel*, we have a situation where a kid doesn't age after five or more years. In *Captain Marvel,* it was Monica Rambeau, not aging after six years. In this movie it was Ned who, after five years, is still in high school for some reason. On the flip side, we have a kid, Scott Lang's daughter Cassie, who was probably no older than ten in *Ant-Man and the Wasp* magically aged to what looks like seventeen or eighteen after five years. Maybe 2018 Cassie is supposed to be eleven in AMATW and sixteen in EG.
A few points not related to time travel:
* It was interesting to see a kinder, gentler Hulk, who is really just Banner in a nerfed Hulk body, but we were deprived of seeing the Hulk unleashed (we did get a bit of that with the 2012 Hulk). The anticipated fight between Hulk and, well, anybody, never materialized. The only story reason he is in a Hulk body at all is so he can survive snapping his fingers wearing a stoned Infinity Gauntlet. Also, once again, it looked like Thanos got the lion's share of the CGI budget. Banner-Hulk looked okay, just not as convincing as he might have.
* Didn't care to see Thor slapped around like a rag doll by Thanos. Thor really fared no better than Captain America and might even have done worse. Isn't Thor supposed to be far stronger and more durable than Cap? This brings to mind *Avengers: Age of Ultron*, where Cap holds his own against the titular villain while Thor needs Vision to stop Ultron beating on him. I'm as big a fan of Cap as anyone, but come on, stop making Thor into such a piker, Marvel Studios. Also, I can appreciate humor as well as anyone, but maybe stop making Thor into such a clown?
* I know they wanted to save Stark's best moment for last - and it was a truly epic movie moment - but it strikes me a bit odd that he could manage to give Thanos something of a fight after having a friggin' moon thrown at him in *Infinity War*, then get quickly knocked out in *Endgame* early in the fight while wearing a fully powered suit. On a related note, it's never really explained why Thanos is so tough. In the comics it is, but in the movies, not so much, if at all.
I liked pretty much everything else (one particular thing I liked was that Captain Marvel didn't save the day, as I feared she might). If I ever watch again, I'll try to think about the rules of time travel as much as the filmmakers did, which is to say, not at all.
(a2a)