Make Them Tougher

In a nutshell, the villains of the Marvel Cinematic Universe have been portrayed as being far too weak – and that has to change in order to improve the reception they get from fans and critics alike.
As viewers, we’ve rarely felt that the superheroes of the MCU were ever in any real danger – and that takes something away from a movie – because, in general, the villains haven’t been presented as powerful enough to defeat them.
Loki’s a great character, but having him manhandled by Hulk did nothing to suggest he was a threat to the entire Avengers roster. The Chitauri were losing in hand-to-hand combat against Black Widow and Hawkeye – how were we meant to believe they were a threat to the likes of Hulk and Thor? Malekith barely looked tough enough to hurt Thor when he had possession of an Infinity Stone, let alone without one. And the less said about Aldrich Killian, the better (Seriously, he couldn’t even fly! Why didn’t Iron Man just blast the crap out of him from afar?!).
