Don't get too worried about the DPS stat. A lot of it is basically incorrect. Think D3. You could have a char with 1,000,000 sheet damage easily out dps a character with 2,000,000 sheet damage due to other shit like elemental dmg, elite dmg, etc. A lot of people are worried about their snipers being "low dps", but the fact is if you're a good shot and they're stable they'll be the most consistent high dps you can get. Vectors/MP5's because of their inherent crit will boost sheet dps and will help melt mobs that get close, but often have small clips and you'll find yourself running out of ammo in long fights.
Most everyone on twitch is running a crafted Vector and a sniper. Sniper for ranged targets and SMG's are basically a tier+ above LMG's and AR's right now. There's literally no benefit to LMG's and AR's and SMG's get up to 25% inherent crit rate. Stupid.