One thing that bugs me, it is not a bug, but it just looks sloppy.
Using the rifle results in you getting a hip shot, all of the abilities are hipshots it just looks unprofessional. While all of the other classes (at least most of them) get a nice aimed shot. I would love for the engineer to have an aimed shot. Even tried the ghostbore rifle, which gave me a nice aimed shot, and a rifle bash.