I need a manual for this things i've jsut had 2 seriously frustrating experiences... i'm guessing multiplayer is less irritating.
Story 1
Ventured into the Arid hills for a Sniper assembly quest at level 11. Fought my way through the first bunch of Skags, fine, moved up to the bandit base. Killed everyone there and started to move up to the next one. Lots of guys there, i annoyingly ran out of ammo and decided to leg it back to the machines... alas everyone at the first bandit place had respawned(WTH?) so i sprinted passed, ran down the metal path past the cleared out Skag pit... where the Skags had respawned(Dammit) I get raped at the machines because despite the fact the game will pause when your changing weapons, looking at the map or anything else, shopping is not a pausable event. (Dead)
I headed back in with full supplies and health packs this time. Managed to fight through everything with ammo remaining before heading round to the main base where i somehow miraculously managed to kill everything and get the loot but barely any ammo left.

Headed home for hand in but alas, everything has respawned again + 1badass Psycho and as he started eating me a full swarm of rakks and midgets came. (Dead)
(Story 2)
Headed back to the Arid hills to get a key to get at Sledge's base. managed all of the Safe House fine, great fun. Not sure though but do respawns happen in "dungeons" liek that too?
Anyawy headed back out and decided i mgiht go scout out Moe and Marley for another mission. Couldn't find them for ages so i just slaughtered Skags in the hope i might stumble on one or the other. Finally found them and pulled them somewhere i'd cleared out. The firey one came but no sign of the other one, all was going well, got him down to 10% health when the other one showed up, not a problem really, they both hit me hard and i had to find cover for my shield and the firey one ran away.(Damnit) I swiftly ran out of ammo and had an emmensely hard time taking the Electric one down but did it. Scooped up the loot and killed some skags for more ammo whilst hunting for the firey one to finish him off. I DO find him and he's at 100% health(FFS)
Anyway, i engaged the firey one again, managed to pummel him down to health so low that there was noyl a sliver of red on his health bar but every single gun type i was carrying was out of ammo and every cave in the place was happily churning out more and more skags.
So what the hell basically? Is singleplayer not the intended gameplay?
I cleared out the bandits from the arena near the begining and those bandits stayed dead, i assumed that's how the rest of the game was going to be and i was impressed that the pace of the missions and the storyline was equal to my characters levelling but now I can be attacking one base but if i take a step backt oo close to an older cleared out base i never know if i'm going to get flanked by more mobs.

Really frustrating.
I also don't like the way that the bandits spawn when you go into firestone. It's like you can never go back to "base" without having to nip out quickly to shut all that gunfire up.
I'm level 14 now btw and enjoying it but really hating the respawn mechanics so far.