Few quick thoughts.
. Thanos was done incredibly well.
. Humour was not as obnoxious as Thor 3
. Space stuff was the best parts, Earth stuff after Stark and co leave wasn't so great/engaging.
. Interactions were definitely great.
. Vision is a dud character in this MCU don't or didn't care for him at all, and the romance between him and Witch? Nah not buying it.
. Thor star thing was completely unnecessary and time wasting, could have had it work from the start there was literally no consequences or anything that happened when Thor took the star's power, made me question what was even the point.
.Cap and Widow massively sidelined, got nothing barely felt Caps presence and he's not the same without out his iconic shield.
.Hulk stuff was annoying as all hell, a plot point that went nowhere and now will be maybe resolved later?
.Ending didn't leave any emotions impact at all, aside from feeling bad for Peter.
Overall though definitely the best MCU film but it didn't really have that tough a competition, massive improvement over the crap that was CW. Solid 8/10.