This movie has a very interesting plot based on iron man having to deal with a mid life crisis as he believes he may die soon, Because of this he acts spontaneous and very erratic, due to him thinking he's going to die and trying to make the most of life, causing lots of interesting drama and really good comedy. The main villain is very entertaining to watch however his reasoning seem very weak and he's not overly intimidating. The story is still well told as it builds onto iron man's character and the comedy keeps it a relatively entertaining watch. The movie also neatly ties into avengers by adding it to the list of starks worries and other points of the plot.