6. SCIENCE!
MarvelYou can't really build an Iron Man suit or an arc reactor. It's impossible to manufacture a super soldier through was injection (and attempting to copy it wouldn't create an unstable green creature). There aren't alternate dimensions out there. But don't let that stop the MCU trying
really hard to pretend that isn't the case. Up until Guardians Of The Galaxy (which rightly ditches with the idea), Marvel movies tended to come with a customary scientist or too to throw out buzz words and give the illusion of some logic to proceedings. That kinda makes sense - the one film that really gave up on science was Iron Man 3, which with its unexplained fire-breathing certainly went too far - but by now it's getting increasingly heavy handed. Sciencey mumbo jumbo is a good way to get heaps of plot exposition across to the audience, but when it's done poorly it just adds to the confusion. Thor is the prime example of this, with Erik Selvig being a character existing purely to provide some in-world scientific grounding to the multiple realms. While that was fine when there were questions how the more realistic Iron Man would fit with a Norse God, post-Avengers it's just getting in the way. Thankfully this one should sort itself out. Captain America: The Winter Soldier's mid-credits sting teased the much less grounded 'Miracles' (what it seems Marvel is calling their version of mutants), while the long mooted Dr. Strange movie should fully push the series into fantasy.