Didn't love it, didn't hate it. Quite a bit of meh to my feelings.
When did the chick who engineered Extremis become a good guy? I missed something, didn't I? Somebody tell me what I missed!
Tony tracks down Extremis kits that have been sold to various villains and even to some not-so-bad guys.
The King Arthur storyline was by far the lamest, and the demon-chick at the end was by far the most confusing.
In between there was a lot of that meh I mentioned.