I haven't noticed any problem with the quality of the loot so far. I wish legendaries dropped a bit more frequently but this game is far better than say Diablo III in terms of the quality of the loot. I routinely see blues and purples in vending machines and chests. They are not always great but the possibility of an upgrade is always there. I even found a legendary class mod for my Siren in a vending machine.
PSN/XBOX Live: Destro75
BattleNet Tag: BaronessMD#1680
Gaming PC: i7 3770K OC 4.2Ghz, 16GB RAM, MSI 4G GTX 970