Deadpool came out nowhere to be a smash hit. This is the same Deadpool that Ryan Reynolds played in the first Wolverine movie. A wisecracking character who gets his mouth sewn shut. Why would you take a character's most interesting quality away from them? It was a dumb move, especially when you've cast Ryan Reynolds, a guy who can pull the character off. Luckily this movie just ignores Wolverine and does it's own thing, while still including X-Men and being part of whatever universe it needs to be a part of.
I've heard people call this an X-Men movie, which sort of makes sense. It has a couple of X-Men in it, but at heart it's an origin story. The movie does a good job hiding the origin story by cutting back and forth from past to present.