Doesn't rise to the level of a popcorn-movie

Rating: 5/10 (13 May 2015)

I've seen all the Marvel movies for the past 10+ years. This one was the worst by far (okay, maybe the 2003 Hulk was equally as bad). There were simply too many characters, no character development, too many random plot-jumps with no explanation. It gets 5 points for the initial concept of Ultron, which seems like a reasonable start for a movie. But it gets no more points for the subsequent mess that ensues. My only guess is that there is a whole mythology contained in the graphic novels, which I haven't read; but you are expected to know it all in order to understand the movie. If you haven't read the Marvel graphic novels, then don't bother with this movie.
I predict AOU will make its expected tons of money, but future Marvel movies will find a more skeptical audience. Fool me once...