As someone who ranked up a Forensic Nightmare SMG to 30, I can honestly say it's not super impressive. I did it because I originally liked the weapon and wanted to test out what a good climb in ranking would do. It does the job, has some useful enhanced traits, but still has issues. The enhanced traits don't feel all that "enhanced" to me. There are better SMG's to use, namely funnel-web. The uninteresting traits available is a downer. Would love to have seen more of a library of choices as we were led to believe. Maybe there are some weapons worthy of the grind, but material cost and just plain better world/activity drops makes it too grindy and uninteresting to me.