Saw it the other day. I liked it, but I'm kind of disappointed that it didn't go farther. For a superhero that lampoons the genre, it felt awfully safe and afraid to defy any superhero norms except for the explicit content. The violence was a lot more subdued than I thought it'd be, but I think I was expecting Tarantino levels of violence. If it weren't for the explicit sex scene in the first half, I thought this movie (along with recent examples like Mad Max) could easily fit into the oft-discussed PG-15 rating that needs to exist between PG-13 and R.
Positives, I thought they nailed Deadpool's tone perfectly, and as everyone says, Ryan Reynolds was born to play this role. I definitely didn't regret seeing it, but I wouldn't go out of my way to see it again.