I am also going to give Infinity War another watch, but upon initial watch I'm giving it a 10/10.
It was bold,it was fun, a lot was going on, Thanos was a menace, and while I have some complaints they are quite minor. I do think The Black Order and Captain America were underrepresented, and there were a few minor leaps in logic that I found hard to get out of my head...
..but it was 150 minutes of pure climax. sure, that might be exhausting to someone who is JUST watching this movie and not all the films that led up to it, but as a climax to 18 films so far as well as a bunch of TV shows (technically, not practically), it seemed to fit. So yeah, myself, my brother, and my roommate all came out of it with this movie as our #1, #2, and #1 film in the MCU respectively. Brother still likes Doctor Strange more, but he admits he's biased.
Wish I could say more, but I was immensely satisfied, I DEFINITELY need to see the next one, and I think it's crazy to imagine anyone giving this a negative review. 7/10 or 8/10 I can imagine if you're pedantic, but this was too fun, too satisfying, and too bold for me to give any less than a 9, but since I loved it, I am giving it a 10/10.
Also, on my global rank, I've got it as 9.7, which is the second highest score I've ever given to a movie. That ranking may change, but if it doesn't when I See it again Sunday, then I don't think it will.