Avengers: Infinity War is the biggest film in the Marvel Cinematic Universe yet. With a huge cast covering nearly every single superhero from the universe (with only one or two missing) including wrapping the Guardians of the Galaxy into it. You would worry about how they will be able to give enough screentime to everyone while not making it too disjointed. Infinity War does this spectacularly and you never feel like a character got shafted in terms of screentime. However, what you do miss is the big battles with all of the characters teaming up, instead, we get various separate smaller teams so it doesn't have quite the same impact as when they formed in the first Avengers or in Age of Ultron. The plot focuses upon Thanos, who finally shows up for real after the tease from a few movies ago. He is searching for the six Infinity Stones, upon which he can then destroy half of the universe to strike a balance. Our heroes get caught up in this and Thanos is the most powerful opponent yet, able to take on several heroes at once and still come out on top.
Infinity War does a really good job at justifying how the characters who haven't met such as the Guardians of the Galaxy come into play. There are plenty of surprising twists and fantastic battle screens throughout the whole film. Watching the previous such as Thor: Ragnarok and Black Panther will allow you to get the significance of some of the actions that occur and various references. It truly shows how jam packed the film is when it starts with a tense scene and then never once include scenes and scenes of filler or talk like most movies do. Infinity War carries its momentum from start to finish and with it all of Marvel's humor which are some of the best yet. Infinity War ends on a massive cliffhanger / sequel hook with heaps of unanswered questions and leaving you to wonder how it will impact the subsequent MCU films before Part 2 of Infinity War comes out.