I think I'm the only one who didn't like it. The violence was overly gratuitous and felt forced in because you need to have horrible violence for it to be Deadpool, not because it made it a better movie. The thing that really got me was that it felt very inaccessible to someone who doesn't know the first thing about the comics; there was never any explanation of what the characters could actually do. So, Ajax/Francis, he injected himself with the mutant serum and did his whole torturing people into mutants (which was totally unnecessary to actually show us, and cheapened it to boot), and he tells Deadpool that it gave him really good reflexes. Neat, I thought, his girlfriend is super strong and he's super fast, that's a neat dynamic. Nope, he also has a maybe-better-maybe-worse version of Deadpool's regeneration, which is revealed when he needs to be able to regenerate to stop the film from ending halfway through. Huh. Oh, final fight scene, this is cool; he's acquired signature paired weapons, apparently, so he's now a weaponmaster as well as a mad doctor. Wait, he just threw Deadpool clean through the air? So he's also got improved strength, because I'm not believing that he had time to be a mad scientist *and* become some kind of axemaster *and* work out enough to be able to throw someone bodily through the air. If that's even a thing, I don't know if it's possible for a normal human to even be that strong. The strong lady sub-villain trades punches with the big metal guy, but then half way through the fight punches him clean through the air. She didn't open with that move because... well, I dunno. Presumably the same reason that the teenage girl could blow up the entire scrapyard but didn't use that until the very end either.
The supposedly hilarious comedy felt shallow and puerile, not to mention predictable (I've got to respect the actors at the end of the film, because to act surprised when he shot Ajax/Francis mid-speech must be an Oscar-worthy feat).
It felt like a film that was catering purely to people who already knew the characters and the setting intimately, and therefore didn't need to explain anything or try and appeal to anyone. It's almost certainly just my personal experience, but everyone I know who went to see it has come back saying it's the bestest film ever and oh, what a wit the writers must have had and how brilliant it is that they've released it and it's a breakthrough. They're also people who would have enjoyed being kicked in the balls if it'd been delivered by a guy dressed as Deadpool. Unlike the other Marvel movies, I felt like I was sitting in an exclusive club of people who'd had a film made specially for them, and both they and the film didn't want me there if I wasn't part of the club already.