Sargatanas, right? I'm on the same world, and I love going into the Thousand Maws of Toto-rak :3
Your complaint is indeed legitimate, 'cause I'd practically live in there just for the atmosphere if it let you go in solo...
I have an hour and a half if you have the time to go right now?
EDIT: I haven't actually done the quests related to the dungeon in quite a long time, but an LS mate and I go in there a lot just for the GC seals. But I don't mind tagging along to help you get through it