My number one gripe... the AR-15 family. I'm still confused as to why there are three different AR-15 inspired rifles in the game. From a design point of view, it's not a good look. The Service Rifle could've been an FN FAL or a G3, the Assault Carbine could've been a P90 or even an AKS 74U, and the Marksman Carbine could've been a souped up M14 or an AC556. That's just their designs, their functions are strange to me too, the Service Rifle is essentially useless after level 10 or so, due to it's slow fire rate, lack of mods, and low damage output for such a long barrel. The Marksman Carbine should have a bit more spread for such a short barrel, an OPTIONAL scope mod, and a silencer mod. The Assault Carbine is okay as it is, but it also should've had a silencer mod, as that would save it from being outclassed by almost every other close range weapon in my opinion.
Another gripe: mod choices.
Why is there a silencer for the 12.7mm Pistol and SMG, but not the 9mm Pistol and SMG?
Why is there a silencer for the Sniper Rifle, which is good enough as it is, but not the Hunting Rifle?
Why does the Hunting Revolver come with a scope, instead of having an optional and common mod? (same with the Marksman Carbine)
Why is there a scope for the 9mm, when it obviously becomes useless an hour into the game?
Why isn't there a mod to reduce the spread of the LMG?
Why isn't there an extended magazine mod for the Silenced .22 Pistol?
Why does the Anti Materiel Rifle hold that many rounds by default, when it should just have an extended mag mod? (same with the Riot Shotgun)
Why not have a three round burst mod for the Service Rifle?
Why not have an automatic mod for the 9mm Pistol?
Why not have a custom stock for the Hunting Rifle?
Again this is just my opinion, and I don't use Energy Weapons so I can't comment about their lack of mods/choices, this is purely concerning guns.