Finally saw IM3 tonight and I came out feeling very meh.
I find it hard to enjoy anything with Paltrow in it to begin with, but I wonder if it was in her contract to appear in the sports bra for so much of the film to try and make sales of her diet merchandise. 
The movie was mostly pretty good. How Killian survived all the previous explosions yet died from the last one was hard to swallow (sure he was regenerating, but he was regenerating in others as well.) I thought that Kingsley was perfect, Guy Pierce was both charming and evil, Downey Jnr his best. cheaply did well with his very limited time too.
I liked the Madarin twist, I get how IM fans feel ticked off, but it was a great twist. There were a few silly plot holes, Killian was too good a fighter (as in moves, not power/muscle twitch) for someone who was almost a hunchback only a decade ago.
The thing I hated was the suit destruction. Sure Stark wanted to show he was moving on, but without the suits, he cannot dream to compete against anyone, protect his loved ones etc. sure he has a great brain, but with nothing to protect it, he is dead. Plus we all know it is all malarkey as he will be back in a suit very soon for Avengers 2. Making all his grand show ponying for Pepper a charade.
It was better than IM2, but I didn't feel great after it finished, the cold close was boring, after a slow starting film with few great action sequences, the suit destruction rung false and I don't want to go see it again at the cinema, or even wait for it on DVD. I may get it once it goes on sale in a year or so.
Looking For: Wreckers Saga TPB Collection (with Requiem)