Carbine is accurate as hell as it is...people's aim just goes wacky because of how much they're pulling the trigger and how many shots they have to hit to get a kill since the enemy can move around a lot more in that timeframe
It feels like it loses something at range.
Storm Rifle is pretty good right now. I've gotten a decent amount of kills with it.
I will confess my time with the storm rifle has been limited. There should be distinct reason to pick the suppressor over the AR though, aside from a cosmetic one.
Both the storm rifle and the suppressor have their own niches - the suppressor will always win out over the AR in ultra close range and the storm rifle + the jetpack is godly on CQC maps like abandon.
The carbine certainly needs a bump and the DMR a nerf, though.
Well my real point is that with a bunch of good weapons the game would just be more interesting. I do get that its easier said than done but aside from a couple of things nothing in this game feels too good or totally useless.