/\ Yeah, all I've found is a Hellfire which wasn't as good as what I was carrying and a Volcano in a vending machine, similarly not as good as my volcano.
Knoxx was too much driving, but the difficulty was reasonable. This is a little too easy, but was overall fun so far, if not a bit predictable. Lots of gun chests, both at Tartarus and on all the quests. Still think farming the armory (which would be easier if it didn't involve killing knoxx everytime) is probably the most productive way to get good guns in large qty's.
All that being said - it is a little easy, and a little too low-level if you're 61. But if the patch applies to everything (including DLC, I mean) in terms of scaling difficulty to the player's level, then the difficulty should be more appropriate once the patch drops.