Avengers: Age of Ultron has been released in theaters in around the world. I've seen the film for myself, and can say it's neither bad nor better than the original.
It seemed clear, as the end credits began to roll, that Marvel has outgrown Joss Whedon. Personally, I'm quite happy he's made the decision to no longer direct Marvel films, because Avengers: Age of Ultron wasn't the movie it could have been.
It was still a fun experience, thanks to the humor and witty one-liners. Furthermore, Ultron is a decent villain — though not of the same caliber as Loki. The heroes, for their part, all do an excellent job... but the same can't be said about Scarlet Witch and Quicksilver — especially Quicksilver.