Not against it, but ain't Underdark a really big dungeon? I mean, it's a system of caves and tunnels that span over(or rather under :P ) Abeir-Toril.
+1 to the Underdark point. It is like a big dungeoun, but it would be nice if there were more places like the festering cove which had extensions within them for a bit of delving in the dark. I REALLY like the Underdark and would like to see it further developed in the realm of locations and hidden zones.
