I don't think the figure is that terrible from what I've seen, it is obviously outdated compared to what a standard current day figure should be, but it does it's job, the most impressive thing for me is how they did the nails.
The clothes could be like that due to a lack of futzing, I don't know if the vest is actual leather but if it is that would explain why it looks so ill fitting, real thick leather like that is usually hard to tailor in 1/6 which is why a lot of brands still use pleather, fortunately we now have real thin leather material available, it's still tricky to tailor but definitely easier and better looking.
Diecast weapons and accessories sound fancy but they don't cast as well as plastic, it's definitely more sturdy but you lose a lot of detail you get with a good plastic mold, but they definitely could painted them better, especially the Colt, which brings me to my next point.
The worst part is the paint apps, they really bring down the over all look of the figure, we're reaching a stage where more and more brands, third party included, are using printing technology in order to achieve the sense of realism, some are using the latest techniques and tech available which results in an insane final effect on sculpts and accessories,
@Asta has brought up The Gunslinger and that figures uses the latest printing tech to achieve tiny details like veins on the face, wood grain on weapons, body hair, etc. When you compare something like that to this, it's difficult to appreciate the outdated paint apps that really belong on an old Sideshow figure, Kaustic should definitely invest in better factories to produce better paint apps, it's their weakest point and changing that could bring their figures to a new level.