Not trying to be harsh, just honest, but to me, these could as well be Nerf guns as bad-ass deadly weaponry. Lack of texturing has a lot to do with that but also many of the design choices, which seem somewhat arbitrary: very large-bore barrels with nothing that indicate an ammo mag capable of holding more than a few rounds; rifles encrusted with appendages that don’t even hint at a function, but apparently no magazines; tubes and pipes that seem like stuff stuck on because it’s cool to have stuff stuck on guns. If they are all projected-energy weapons, then things are perhaps a little better because those are as yet all imaginary, but functional power sources for them would likely have significant bulk. A lot of the designs also look like they would be difficult to use accurately because of irregular weight distribution.
If you look at actual weapons, even the most advanced and strange-looking of them are that way due to functionality – all the parts have a purpose and it gives the object an inherent unity of design that no crusting of greebles can mimic.
On the plus side I think these are very well modeled, helping convey a sense of mass and high-precision manufacture. But there is nothing about them that says “Don’t mess with me or you’ll regret it!!”