I think I would give this movie a solid 8 or 9 out of 10. So slightly higher than Marter. I'd certainly put Avengers, the various Captain America movies, Iron Man, and Guardians of the Galaxy above this as a movie. However, it did what it set out to do and what I wanted it to do. It's certainly better than Man of Steel, but that may not be a fair comparison.
The movie was violent and funny. There are plenty of jokes and fourth wall breaks and that's was what I wanted. And Ryan Reynolds owned this character. He is Deadpool, much like other people in the MCU.
Hell, even the opening credits are funny.
My only complaint is that we won't get to see him opposite Chris Evans as Captain America or any of the other MCU cast members unless Fox and Marvel come to some agreement. Though, they may be able to do something. Just look at the climax of the movie.
Also, I was really hoping they would make the reference they made in the after credit scene. I was blown away that they actually did. That alone makes me love it even more.