The. Best. Marvel. Movie. Ever.
I don't think that there is any other way to describe the movie. A perfect comic superhero movie that is not as dark as some tries to show making it possible for a fan to see without squinting their eyes and trying to make out what in the hell is going on.
Character wise, I felt was given equal screen time justice considering what a huge crossover this movie had without losing the overall plot pacing. Funny and seriousness was combined to make it the best movie ever yet.
The only downside I felt was the overly weakening of The Collector and denial of using a particular stone when it was already in possession.
Overall, I think this is one movie that you would sympathise with the villain and not with the heroes.