Sean Gilman’s review published on Letterboxd:
Just a big old ball of comic book goodness.
Not greatness, the MCU movies never strive for that, and that's ultimately their biggest weakness: a lack of ambition. But we're only halfway through the story. I guess we'll see if it ends up amounting to anything more than spectacle. It might, Thanos is an interesting guy. But I don't have much faith that the Russos are the folks to gives us anything special.
Also, what happened to Elizabeth Olsen's vaguely Eastern European accent? How did two years living with a sentient English robot make her suddenly start talking like an American?