Re: Should the archenemy be first?
If I was my younger self I would have said the archenemy should always be first since I was so used to seeing it in movies like Spider-Man, Daredevil, Fantastic Four, X-Men, and Batman.
These days, I'd say wait a movie or two before introducing the archenemy. Build him/her up.
2015: Avengers: Age of Ultron, Star Wars: Episode VII, Daredevil, Ant-Man, AKA Jessica Jones
2016: Captain America: Civil War, Batman v Superman: Dawn of Justice, Suicide Squad, Doctor Strange, X-Men: Apocalypse, Luke Cage, Iron Fist, Sinister 6, Deadpool, Gareth Edwards' Star Wars, Warcraft