atm engineer is worst class of all, but with the patch 5.2 it will become a good class like all the others
as for now,
in pve you can do damage, but in pvp you are a free kill all the time, even for undergeared players
also, engineer is one of the classes that "need" dragontears because the moving hoverpad is almost essential for pvp
turret mode does not only make you stationary but also has a VERY long cd which makes this ultra rare
the hoverpad btw does only protect you from physical dmg, so it will be worthless agains the majority of attacks...
also, the enhanced variations of the 2 main-shots are almost useless too, and the engineer is constantly out of energy, which means you do 2 or 3 shots and then have to wait very long for every next shot...