I gave Undershore a shot last night, hoping to get the 36% haste ring (zonewide rare) I read about somewhere on here. It is soloable at 62 (~1200ac), but very slow experience. The mobs have a ton of hitpoints and the weak ones hit for 300, so you'll be killing slowly and healing alot. But if you want the ring, you can pull singles pretty safely across the water from Freemind (I didn't lev, I just fought on that side). I killed 15 or so before I got bored and went elsewhere.
Btw, leave the Illisians alone. I got a cleric with CH and fought him for a good 15 minutes till he ran out of mana.