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* It's interesting to me that the MCU movies retained the Marvel Comics' preference of keeping the mutant superheroes (X-Men) separate from the non-mutants (Avengers, Thor, Iron Man, Captain America, etc.).  Then there's Deadpool, even more separate in the comics, but he ties in with the mutants pretty regularly.

There actually is a practical (not creative) reason the X-Men are separate.

Back in 1996 Marvel declared bankruptcy and sold the movie rights to their most popular characters.  Sony bought the rights to Spider-Man for $8 million, when they could have bought the rights to every character for $25 million!  Fox bought the rights to Fantastic Four, X-men, and more.

When Marvel decided to start making their own movies, they had only their 2nd-tier characters to choose from. They decided on Iron Man first.

With the success of the Marvel franchise, Disney/Marvel came to an agreement with Sony to allow Spider-Man to appear in the Avengers movies, but otherwise the Spider-Man movies are still being done by Sony.

Disney just completed their acquisition of Fox and thus got the rights to X-Men back, so I wouldn't be surprised if we see some X-Men crossing over into other Marvel movies.

* Supposedly Robert Downey Jr. had a great deal to do with the ongoing scripts being so entertaining and watchable.  There's a great deal in the movies that isn't in the comics.

While in hindsight Robert Downey Jr. was brilliantly cast, at the time it was considered a big risk because of his substance abuse problems.  But those problems are what made him a perfect Tony Stark, who had all the same problems in the comics.

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* It's interesting to me that the MCU movies retained the Marvel Comics' preference of keeping the mutant superheroes (X-Men) separate from the non-mutants (Avengers, Thor, Iron Man, Captain America, etc.).  Then there's Deadpool, even more separate in the comics, but he ties in with the mutants pretty regularly.

There actually is a practical (not creative) reason the X-Men are separate.

Back in 1996 Marvel declared bankruptcy and sold the movie rights to their most popular characters.  Sony bought the rights to Spider-Man for $8 million, when they could have bought the rights to every character for $25 million!  Fox bought the rights to Fantastic Four, X-men, and more.

When Marvel decided to start making their own movies, they had only their 2nd-tier characters to choose from. They decided on Iron Man first.

With the success of the Marvel franchise, Disney/Marvel came to an agreement with Sony to allow Spider-Man to appear in the Avengers movies, but otherwise the Spider-Man movies are still being done by Sony.

Disney just completed their acquisition of Fox and thus got the rights to X-Men back, so I wouldn't be surprised if we see some X-Men crossing over into other Marvel movies.

* Supposedly Robert Downey Jr. had a great deal to do with the ongoing scripts being so entertaining and watchable.  There's a great deal in the movies that isn't in the comics.

While in hindsight Robert Downey Jr. was brilliantly cast, at the time it was considered a big risk because of his substance abuse problems.  But those problems are what made him a perfect Tony Stark, who had all the same problems in the comics.