I generally like all the new designs, visually they look great.
The pulse rifle especially, if it weren't for the nonsensical parts. Besides that, for me it's easily the best looking one among the modernized variants, and second only to the original.
The DT-57 Medved is the Aliens: Fireteam version of the Kalashnikov MP-155 Ultima. It's funcional, looks cool, perfect for videogames.
I could do without the big bright blue circle on the Type 78, otherwise it's not bad. Different. I'd try it out.
The new smartgun... Shortened, but chubbier with the magazine moved to the underside. (maybe that's the problem, Hicks?) Sure, it loses the long and sleek look of the MG42, but it actually looks like some thought went into alleviating the shortcomings of the original M56 smartgun (long, difficult to manouver in close quarters). If the original was the equivalent of the contemporary M249, the new one would be the Para version of the M249. I like it, it makes sense. Maybe not as a replacement, but as a complement. Especially considering the prevalent environments the colonial marines are fighting in. I bet Drake and Vasquez would have preferred it while clearing all those corners.
M42A3. Just yes. Maybe a different designation to differentiate it further from the M42 from the Tech Manual. That one was semi-automatic, this one looks like a bolt-action. So they're probably meant for different applications.
OCAP-91 Volcan. Looks good. Not a fan of the glowy bits, but it's a repurposed civilian model so I guess it's kind of ok, although the military would have removed/covered those.
The only thing I actually dislike are all the random glowy bits on the new weapons and armor which seemingly have no purpose or reason to be there besides to be glowy bits.
It's like designing a weapon that is also a target. Same goes for armor, but probably worse. Complete nonsense. And completely unnecessary.
Maybe it looks cool in the civilian world, but it's a hard no-go for military service. It's out of place here.