He was my fav character in X-Men Origins, and Ryan Reynolds handled it pretty well.
I love the fun side of Deadpool and that's what makes him one of my fav marvel heroes.
Technically, Deadpool is not a hero, nor a villian. He's Marvel's 'Merc With The Mouth' and has actually taken side with both heros and villians. It mostly depends on who pays better. The comics have him featured both as a hero and villian sometimes, but ultimately, he's a mercenary out for his own personal gain.