This is another over hyped movie where the consensus of critical opinion is better than it should be. The movie Avataar comes to mind. That movie too had a similar largely favorable reviews on release but was later found to be underwhelming.

The plot is thin. The birth of the Ultron is hurried, the tender moments seemed tacked, the fight scene at the end is a reprise of the fight scenes in the first Avengers movie. The birth of the Vision may be useful in later films but here he hardly plays any role. The death of Pietro is similarly accidental. The fight between the Avengers seems pointless, and looks like a school brawl. Even the looming end of the world fails to inspire any sense of urgency or dread.