YES!!! I've seen it! The biggest movie event in BOX OFFICE HISTORY!!! Would you like to know my review of the film? I'd be happy to tell you...my review is this: DIFFERENT THAN YOURS! I absolutely loved it - but guarantee my experience is completely different from yours. I went with my wife and daughter, my daughter is 7, so that changes my experience. Did you go with kids, or your friends? It didn't bother me that is was 3 hours longs - it could have been 9 and I'd be okay with that. But maybe that's too long for you and you had to miss a part because of running to the bathroom. Maybe you only went because everyone else was. Maybe your expectations were too high and it let you down...maybe you had a few problems with the plot but can overlook them because you love the movie so much...I have no idea, my point is my review really shouldn't impact your review!
I'll say this much...I enjoyed every second of the ride...from the beginning with Ironman...and then 21 movies later with Endgame...job well done! I can't wait to see it again. I'd love to share my favorite parts...but I refuse to give a spoiler (don't want to get beat up!)