Saw it last night. It was... okay.
Some of the characters acted in an odd manner - Thor and Dr Strange were especially rude and seemed out of character. Also - at the end of Thor: Ragnarok we saw the Asgardians picked up by the Guardians of the Galaxy - yet that didn't happen in the film and therefore seemed like a continuity error.
Also - Thor needed another weapon? Wasn't it established in Ragnorok that the God of Thunder didn't
need a weapon??
Putting different teams together was done well, but all too often characters seemed underpowered for the sake of plot - the Scarlet Witch and Vision were helpless against a couple of underlings at the start? Why didn't Dr Strange simply drop Thanos into another dimension or far-away world?
While it was good to see Thanos had an actual motivation, he was boringly indestructible. The scene when trying to remove his gauntlet seemed to take forever - why didn't Iron Man simply cut the guy's hand off and so get the job done more quickly?
I'm also left clueless why Captain America looks so different and no longer has his shield - did I forget something from Winter Soldier?
It not so much that I didn't enjoy the film - the character exchanges, as usual, were fun - but the story seemed driven by convenience, papering over potential plot holes. The tone also seemed more like a comic than the Marvel Universe films to date.
And does anyone seriously think the deaths at the end will stick? Hint: no one of consequence ever seems to die in the Marvel Universe.