Bring something to occupy your attention.

Rating: 6/10 (26 August 2018)

Meh.
At almost 2-1/2 hours, A:IW is a mish-mosh of tangled story threads that have no place in the same film, barely able to justify their absurdly overlong fight scenes, each of which includes ludicrously inconsistent strengths and weaknesses on both sides.
Early snarky dialog gave me the impression that there would at least be the edgy humor that characterizes the best of the Marvel films, but the gaps between instances of such writing are huge to the point of boring.
The story is thin, hard to believe (even for a Marvel film), and will be largely incomprehensible unless you remember almost everything from the eighteen other films in the franchise (or, as I was, are willing to pause repeatedly to Google up the answers to your questions).
My teenage son often watches videos on his iPhone while simultaneously playing a game on his Nintendo Switch. I find it hard to believe he can really pay enough attention to know what's happening in a video while also playing a game. After watching "Infinity War," however, I would recommend having a toy in your hands if you plan to see it.