Many questions left.

Rating: 9/10 (21 May 2018)

Many questions I am sure are intentional, but, many I bet will never be answered and just left to assumption...which is annoying given flow from previous films.
How is Hulk so easily overpowered by Thanos (yes, I know in most cases Thanos would overpower him), but, then teen Spiderman, Iron Man, and company can hold him in place long enough for Mantis to try and calm him while they try to remove the Infinity Gauntlet? I find it a bit ridiculous. Not to mention, Hulk took much harder beatings from Abomination and Thor without being knocked out, yet, Thanos gives a throat chop, some body shots, and body slams him into unconsciousness? That ship's floor is harder than the arena walls on Sakaar? Harder than the gladitorial hammers? Harder than Mjolnir? Harder than every cement wall, steel object, explosive object and even the ground itself that Hulk has been smashed into or with? It just doesn't jive. It should have at least lasted a little longer and made the Black Order a little more concerned.
Who are the Black Order? I know who they are from comics and reading about them, but the movie offers no explanation of them or their unique gifts or station with Thanos. Thanos does mention "the Maw" once. No development.
Asgardians.
Still no explanation of Where Lady Sif is and whether or not she died from Hela, Surtur, was on the ship, or was off world during all of this and is still alive (until possibly "The Snap").
Valkyrie, Korg, Maek. Same thing. They were on the ship, at least at some point. Asgard was destroyed. The ship is all that is left of Asgardian people, with possible exception of some being off world during Hela's attack. Then the ship is destroyed, implying all Asgardians are dead, with known exception of Thor. Then later Thor mentions that half his people were killed. HALF? From what we saw, it was ALL. So if there were escape, hopefully it is acknowledged in the next film. Somehow, with this merrygoround of directors of Marvel films, I doubt it. And if Thanos can will away with a snap, half the universe, why wouldn't he be certain to include those that may challenge him in the future? Like Thor.
I'd have liked to have seen more about the dwarves.