I've noticed that after I got the Stranger's Rifle and played as a hunter, I couldn't use it for more than a few games. But when I gave it to my warlock, I could use it just fine. I traded the Stranger's Rifle of Strange Suspect earlier today and it's pretty nice. Also found that using an auto rifle is weird on my hunter since I use Thorn or Timur's Lash. Maybe because I'm used to a gun type?