Iron Man 3 is a weird one, it was one of (at the time) 16 movies to have grossed a billion dollars or more all time and was the 5th highest grossing film of all time, yet only the 2nd highest of that year. Yet it met with some pretty mixed reviews and some people actually consider this to be one of the worst in the MCU. Admittedly I do not personally fall into this category, but I do recognize that while it was a great movie it did leave comic fans much to be desired.
This movie sees Tony Start dealing with Post Traumatic Stress Disorder (PTSD) after the alien invasion of the Avengers movie. Really can you blame him? Dude went from fighting terrorist and a Russian dude to finding out there is life on other planets and gods with magic hammers floating around.
Speaking of terrorist, that is what Iron Man is back to fighting, a terrorist named Mandarin. After bombing a bunch of stuff, Stark threatens him on TV so Mandarin sends a helicopter gunship to shoot up his house. Weirdly the plot of this movie is a huge dick waving contest between Iron Man and Mandarin.
As you would expect from the MCU the sound quality, visuals and acting are all high-class with a strong soundtrack. The story itself for Iron Man 3 is the only part that people really disagree on. I enjoyed it, tho I would call it middle of the road for the MCU, but others have hated it. Best wishes and may the gaming gods bring you glory.