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
he wasn't in the suit.
Now knowing the "reality" of the movie its hard to imagine appreciating many of those scenes again.