I didn't pick "that one unique that by some miracle happens to be better than crafted weapon", it's first unique i found (if not the only one) that is compared to something on wiki.
It's the only detailed comparison between an unique weapon and a comparable crafted version on the wiki. I made it because Gluck 17 seems to be the only weapon that is very comparable to late game craft I personally gravitate towards, rather than being straight-up inferior or offering something unique that crafts don't have.
I think the main problem with unique guns in general is that smart modules are just way too good to pass up. If you look at other uniques, especially unarmed, some of them are pretty decent and can compete with crafts.
For burst weapons (so ARs and SMGs) smart module is pretty much a must have. The high damage bonus on nearly all attacks is so ridiculously good, it easily outclasses even the burst-specific weapon mods such as the muzzle brake, barrel compensator or forward grip.
For sniper rifles, it's what makes them capable of reliably 1-shoting almost everything in the game with Aimed Shot and Snipe. I tried to experiment with a Rapid Spearhead that uses the barrel retractor instead of the smart module, but sacrifcing the 1-shot reliability of Aimed Shot/Snipe for a bit more close range precision is simply not worth it. The only other mod Spearhead can use is an extended magazine, but that's obviously worthless in comparsion.
That leaves us with pistols. For pure pistol builds, smart module is still one of the superior mods, especially on Hammerers to boost Aimed Shot and Execute damage even further. It's also a must have on a silenced 5mm Neo Luger since it deperately needs every bit of bonus damage it can get.
A 9mm Neo Luger that is supposed to be a sidearm rather than the main weapon is pretty much the only firearm in the entire game where smart module might not be the best choice, but it still would be a good choice.