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They only had two hours and change worth of film to write Ultron out as a global threat.

Granted, I can understand long fans of Ultron being slightly upset that it wasn't the be all end all threat that a global invasion should represent. But, the same thing could be said about the Chitauri being easily defeated since their global invasion never made it past Manhattan Island with a team of six individuals beating them back in an afternoon.

Whether one considers it a weakness or good serial story telling, the MCU is all about set up and development for future chapters, and AoU is a prime example of this.

It introduced the existence of other super powered beings (vital for Civil War).

It demonstrated an increasing liability that super powered beings represent to the rest of humanity and a growing backlash and fear towards them.

It revealed that the scepter did indeed house the Infinity Mind Gem (more development for Infinity War).

It revealed Stark's vision for Earth's future defense from alien threat (one without the Avengers)

It introduced Wakanda and the source of Vibranium (leads to Black Panther).

Ultron itself simply represented the evolution of the first artificial intelligence in the MCU. It's a given that Ultron could be written back into the MCU whenever needed due to its digital lifeform origin. Ultron simply has no place in the Civil War or Infinity War and AoU needed to have a resolution considering that previous films built directly into the events that took place in its plot.

There were plenty of other things going on; almost too much for a single movie compared to the relative straightforward simplicity of The Avengers.