I think the obvious one is HVR, the other one being OCA. The sort of recent relatively speaking of course, changes to the OCA put a lot of the other SMG's into an awkward position. I don't like power creep, personally I feel overdamage should just not exist in the game but remain exclusively for snipers. For instance something like the Colby 45 just as example should just do 200 damage, I think this should apply for every gun that isn't a sniper.
I also believe Little Orbit should avoid putting anything extra into the game that may induce faster encounter times, drawn out gun fighters are more preferable in my opinion.