I enjoyed IM3 while watching it but was left disappointed and empty as i thought about it afterword, i don't feel a desire to watch it again.
I was kind of like that too. I thought the attack on Stark's mansion was so awesome until we learn who was behind it.
I thought the airplane rescue was so awesome until we learn that
Spoiler:he wasn't in the suit.
Now knowing the "reality" of the movie its hard to imagine appreciating many of those scenes again.