No, DULZIAN has 5.00 refire, also, it is the best looking gun in the game imo. Codes are useful, if you have the right ones, some however are not, and should be avoided, its all a question of comparing the stats
My impression is different.Codes are good for me.I have 4 BLOODSTONE's on my bomber,they have 1120 hull damage and 500-600 shield damage.In Order there is no such weapon with so high shield and hull damage.there is magma hammer with 1020 hull damage but very small shield so you need shield busters with them.They don't drain power a lot and they look nice.Only bad thing is slow refire rate 2.00,so you need to aim good.
Please, don't promote weapon modding. It's only esthetics you say? Well, it also determines the size of your projectile. Some other folks could also think "Why change just this, there are a few interesting numbers I could change to get some better results". Please, just don't.
To the original topic... Codes still have some use, but they are mostly beaten by faction class 9s.