Have to echo all the praise in this thread. I went into the cinema not expecting a lot because I didn't really enjoy Iron Man 2... but this was great fun. Darker, funnier, and more exciting than its prequels with some classic quotes.
Half of the audience left when the credits rolled... we couldn't believe it... but then the inevitable post-credits scene didn't give anything away so it didn't really matter.
Oh.. and I loved that the Mandarin was a Liverpool fan.