Okay, so when i watched twilight, i was not especially impressed with this actor, however my opinion completely changed when i watched the latest episode of Criminal Minds in which he guest starred. He proved he is an incredibly versatile actor who can play a range of roles. In his guest spot, he played a [spoiler] serial killer with a dissociative identity disorder [/spoiler].
Normally, the show is pretty clear cut and the criminal is completely unrelatable. However, Rathbone added so much depth to the character he didn't seem all that alien. In fact, you ended up kind of rooting for him and hoping he gets over his illness. In addition, he is impeccable at switching personalities. When his character switches personas, all you need is an oblique shot to tell that he did. All in all, he elevated a normally mediocre and kind of outlandish episode to possibly the best episode of the season.
Though i wasn't a fan to begin with, i have to say, he is really talented and i hope he finds success. I kind of wish he had a leading role in a show since he is so convincing to watch. In any case, i'm a fan now :)