I am a huge Marvel fan and I think the movies are awesome. But there are things that need some polishing. Screen Junkies did upload a video on How to fix Marvel 8 months ago and I will be putting some of their input on this post.
So my biggest concern about the Marvel Cinematic Universe is that they have given rights to other characters that could be crucial to a Civil War movie. Sony owns Spider-man and Fox owns X-men and the Fantastic Four. Sure Marvel also has a lot of characters they could work with such as The Avengers, Guardians of the Galaxy, Ant-Man etc. But how awesome would it be to see all of these iconic characters in an awesome, action-packed, funny and crazy movie where they battle Galactus, Loki, Venom, Magneto and every other villains. Speaking of villains...
MCU really only has 2 major villains, Loki & Thanos. In Iron Man Obadiah Stane dies. In Iron Man 2 Ivan Vanko/Whiplash dies. In Captain America: The First Avenger Red Skull dies, but it's still cool that Hydra stayed. I know Arnim Zola stayed as a robot thing but I don't think he's much of a threat. In Iron Man 3 The Mandarin was just an actor. In Thor: The Dark World Malekith dies. In Captain America: The Winter Soldier, The Winter Soldier isn't really a villain by the end. And in Guardians of the Galaxy Ronan dies. I know that there is still Baron Wolfgang Von Strucker and Ultron will come soon but Ultron will probably die. So we're left with Von Strucker, Loki, Thanos and maybe The Winter Soldier. Either they have to get more villains or stop killing them off.
Those are my only complaints about the MCU because Agents of S.H.I.E.LD was boring at first but now it's really picked up. I love everything else about the movies.
The next Marvel Movie is Avengers: Age of Ultron. It hits theatres May 1 2015.