5) It’s Funnier Than Any Of Marvel’s Movies
This isn’t necessarily a criticism of Marvel, but Deadpool is funnier than any MCU movie. The MCU films, in particular Guardians of the Galaxy and Joss Whedon’s two Avengers, are somewhat unique among comic book movies in that they possess a lightly humorous tone missing from most. It makes Kevin Feige’s superhero universe on the whole more enjoyable as popcorn entertainment than, say, any Batman or Spider-Man film.
Deadpool, unlike Marvel movies, is styled like a comedy (more specifically a romantic comedy) with superhero trappings, rather than the other way around, as for example Guardians is.
Where Marvel movies drop jokes in now and again to lighten the mood, Deadpool throws gags at the audience relentlessly, much like a conventional comedy would. It gives Deadpool the edge over any Marvel movie in the humor stakes.