It made no sense. The armors in the previous films were pretty durable for the most part. All of the ones in this film were breaking upon impact. Very annoying.
I also second the mention that
Spoiler:
Iron Patriot went down far too easily. They could have had fight scene with him against two or three of those Extremis henchmen but instead.......
Not sure why I'm hearing alot online about the music. Was nothing special. The score for the first Iron Man was pretty awesome. All the villains are pretty sub-par in this series. Only one that I was feeling was Obadiah Stane.