Its quite easy to design the deck around this with a few XP and i cant help but feel that some of the reviews are basically saying "if you design your deck without thinking about your signature weakness, then it will shaft you".
I've got Underworld Market so i just have about 6 or 7 illicit guns in my underworld deck, along with Fence. its just 5XP entry point into a deck that doesn't need all the cards out.
It means i can reliably guarantee to have Fence out after a maximum of 5 rounds, (average 3), and then every firearm in my deck becomes fast at no extra cost. sure you need some economy, but with fence Bank Job is a no-brainer, also in the underworld deck. A few more XP and you have Bruiser and you can reliably play and pay for your many guns easily, and fast.
The min-maxing approach of having 3 or 4 loaded guns out all the time is high risk, just keep the resources till you need to play a fast, illicit gun, and fence will do the rest. I'm tending to also leave the guns out where possible, and mid game i get 2 or 3 empty guns shuffled back into my deck for reuse.
The major added advantage of Underworld Market is also that getting a gun is effectively guaranteed, at the very worst you will get a gun by round 2. So you don't need to mulligan heavily for weapons; you can mulligan heavily for action (Leo De Luca and Haste); and/or resource generation (Lone Wolf, Bruiser or Stylish Coat).