Lame
The movie is very fast paced, lots of action and little plot. They tried to make Ultron funny a few times during the movie and Ultron is never funny and hates human traits. The Vision is powered by a solar jewel not the an infinity gem, and the regardless the mind stone is blue not yellow. They are basically breaking up the Avengers in the end because of contractual reasons (from what i heard Robert Downey Jr, and Chris Evans already should be leaving soon). Then it seems like they are headed into civil war but contracts between sony and marvel will get in the way because Norman Osborn is Iron Patriot, not War Machine, and Norman Osborn is part Spider-Man which is owened by Sony. Then a big part that comes after civil war and in a way during is dark avengers which includes Venom which is also part of Spider-Man which is also owened by Sony. The way Ultron was destroyed was weak. The X-men were ruined from joining future Avenger initiaves again because of contracts. The way the introduced the two X-men was horrible and ended up killing quicksilver for some reason. The X-men also play a role in civil war and in future Avenger teams. Then theres the big elephant in the room which is how Ultron came to be and what Avenger should have taken up a big role in its making which is Hank Pym. Thankfully they are finally making a movie about him even though he was a founding Avenger (not Captain America) (the actual founding Avengers were Iron Man, Thor, Ant-Man, Wasp, and Hulk). So the whole premise that Ultron was created to house the Supervillans that were housed in the negative zone went out the window and we ended up with this cheap watered down version. I also don't know how The Vision is going to live once Thanos gets his hand on the mind gem albeit The Vision does die and come back a few times in the comics from what I can remember.