Well, I didn't -really- expect them to seriously whine, but who knows.
Well, we started last night. I have..
-A Dwarven Barbarian (CN)
-An Elven Rogue (CN)
-A Human Cleric (CN)
-A Human Monk (LN)
I was a bit surprised by their alignement choice, but oh well, they're the ones who'll regret it somewhat.

While they are now aware that they cannot leave, I don't think they really realize yet that it'll be like that for a loooooong time. They were -somewhat- prepared, but there was a few things they had talked of going back to town once they learned more that, well, obviously won't happen now (mostly hire hirelings). They are trying to make good use of whatever spare resource they find, including "pickling" meat in the barrels of vinegar. Orc meat, and fiendish rat meat, that is.
I've had two PCs fall to negative at the first darkmantle attack (Death from Above), mostly because it took them by surprise, and it took them a while to realize what was going on. In a funny twist of fate, they had mentioned looking at the ceiling in -all- previous rooms, but didn't in that one. We didn't get to play that long on that night, since we started pretty late, and I had to actually -get- them there, so they only got to interact with the 3 despondent orcs. Things are gonna get more.. Interesting when they get a bit further.
They did try to use oil to burn the fiendish rat swarm, which was pretty.. amusing. And the dwarf is now nicknamed "Doombelly", for killing both the darkmantle (in a grapple) and part of the swarm (using a shield in a somewhat.. Different shield bash) with Belly Flops. All in all, fun times. We play again tomorrow night, yay!