I'm a huge MCU fan and have been since Iron Man was released all those years ago, and I saw this in all it's glory yesterday afternoon on a rather large cinema screen.
As T800 said above, it's a lot to take in and quite different in parts to a lot of the MCU movies before it.
I don't know whether I over-hyped it in my head and expected too much, but it didn't completely blow me away like Infinity War did, I'm surprised myself!
It does bring Phase 4 to a satisfying conclusion and paves the way for the 'new era' and next wave of films though, and is an amazing cinematic event in it's own right that really needs to be seen on the big screen to appreciate it fully.
I initially gave it a 10 on IMDB, then I thought I was just giving it a 10 for the sake of it so reduced it to 9 lol. When I give it a second watch on blu-ray it will quite possibly go back to a 10.