On solo the final boss, the raid boss and the secret boss were all painfully easy. Ran out of ammo? in normal mode, really? Running out of one gun sure but most of the beam lasers end up better than dual pistols even when spec'd for it. Because the beam is basically instant hit and disgustingly fast fire rate it gets hits much more often on moving targets than pistols which a target moving sideways bullets miss a lot.
Then simply because beams with +150% continuous damage mods drop so often in every flavour. Again Nisha's aimbot skill + continuous fire damage and no missing basically make it ridiculous. With dual wield you lose damage aiming to get critical hits in aimbot mode as it goes to one gun. With the beam you don't. I'd say half the time I end up doing more damage with beams than pistols. This does depend on stage of the game, towards end game I did finally get a truly epic pistol for the level, 422x2 damage pistols(I guess I was level 30 or so, at level 36 I think the highest pistol damage I've seen is something like a 600 ish purple, so these guns are lasting very well) with explosive damage as well is pretty awesome. But I'd say for 85% of play through beams did more damage than pistols due to aiming/critical damage and simply having much stronger lasers than pistols throughout most of the play through.
Got a silly number of legendaries also, I got the package grenade jobby three times in the first play through, from the number of people that have gotten it I think it's an almost certain drop by design at some stage. Got legendary shield, class mod, oxygen pack, 3x grenade and about 2 guns in the first play through. oxygen pack and maybe one of the weapons came from vending machine, rest from drops.
Farmed the secret boss, maybe 8 kills to get the rocket, which dropped so low level it wasn't even useful for grinder as no point having a 10 level to low legendary for second play through. Did the raid boss twice, final boss once(extra)(if you go in without paying the moonstone the normal boss spawns again). I got a leg on first normal go at the final boss, none on the other three, then started tvhm as I was bored.
I'm about 98% sure I saw one legendary(again 98% sure it wasn't money) fly off into a crack in the wall and not able to pick it up. Also seen a legendary get stuck way up above head height, I was running around picking crap up for ages and came insanely close to missing it completely.
ON second playthrough I've seen at least 5 legendaries in vending machines in the first, I guess 2 hours of the playthrough, if that. I've bought two, others haven't been useful for Nisha. They don't seem particularly rare though at all.