In my experience...
Most bad guys want nothing to do with a firearm.
Those who do tend to be professionals. Bad guys read gun magazines. Bad guys practice shooting regularly. Bad guys use their own version of tactics. Bad guys know and understand the value of various firearms. Bad guys practice and perfect their tactics.
I wouldnt underestimate a bad guy who's trying to hold me up with a lorcin as being unprofessional based on the quality of the gun. He may very well be using a cheap gun, for the throw away quality if he's chased by the police. Then save his Glock for saturday night when he might need a gun to defend himself against another bad guy.
Never underestimate the ability, or tenacity of a criminal.