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.
Deadpool in Xolverine wasn't played by Ryan Reynolds,just plain Wade Wilson was, so hopefully they wont use him like that. It'd be nice if they used the plain old Wade Wilson but in a Deadpool costume rather than sewn-up mouth, eye laser, knife-coming-out-of-his-hands Weapon 11 version. I still wanna see it though.