This is not a film for outsiders to the franchise, but it rewards those who followed along.

Rating: 8/10 (31 May 2018)

To review this as a traditional film is a bit of a fallacy, I understand the reasoning but there is an aspect to the MCU that needs to be acknowledged by critics and viewership: These are episodic films. They are essentially a long-episode series. They are not stand-alones.
If you have not seen the major releases that play into this title (the Guardians films, Captain America: Civil War, Thor: Ragnarok) then you will neither understand nor enjoy this film. It's to be expected but I don't think it inherently makes this a weak episode-film. It is among the strongest MCU episode-films.
The film itself is one of the few MCU films that has an unconventional edge to it. Its central plot plays through the motives and actions of the villain, with the heroes playing supplementary roles in their various approaches to defeat him. The characters are overall well-written, though there are certain ones that may feel dubious to some viewers (I have seen mixed opinions on the Guardians' portrayal but I enjoyed it.)
Thanos himself is interesting and flawed, as well as fun to watch both as an enemy to our characters and as the possible protagonist. His power also appears to be over-the-top but it actually is quite balanced well in the end of the film.
McGuffin-hunting may break the film for others, and I can understand that, but the nature of it didn't bother me because I found it handled in an appropriate way.
Infinity War is not perfect by any stretch, I contemplated rating it a 7/10 instead of an 8...however I think tit was a very well-executed film with many redeeming qualities, and I hadn't enjoyed a Marvel film to this degree in a long while, and though I agree it's overhyped, I don't believe it should have to fit into the boxes that traditional critics continue to try and push on this episodic film series.