I think Iron Man 1 is definately the best IM film and one of the best MCU films in general. I'm really looking forward to Ragnorak. I don't hate any of the MCU films but I think The Dark World is one of the weaker MCU films.
*Spoilers*
I'm also curious how the film ends since that Infinity War teaser showed him falling onto the Guardians spaceship. Even Thor meeting the Guardians of the Galaxy has me hyped