Ratslayer was actually kinda tough for me to get on hard/hardcoe.
Those rats in there are brutal at low level! Especially since you don't actually have any good weapons yet, since you're going in to get one. I don't think I died (almost did a few times) but ED-E died several times and I had to reload.
yeah, i went in there at level 6, on normal, hardcoe. decided to have ed-e waiting at the entrance after 2 failed attempts.
those rodents are really tough, but with some dynamite, psycho, med-x and some tactics, i finally prevailed.
and damn, how satisfying it was to hold the reward in my hands then