Same thing for me, BF 2 dungeon completely unpopulated except for the final level. I seriously doubt this was intentional since the area was designed for levelling up...
There should be a blue flag showing on the map for the level you're on, head towards it to go further down.
That's the problem. Level 3 is one big room, with nothing in it. No monsters or anything. There's a blue flag but I can't physically get to it because the room has no exits.
Ok, so I didn't level up, but I sure did get alot of free loot out of that dungeon! Not that it matters, none of the merchants have any gold anymore <img src="/ubbthreads/images/graemlins/disagree.gif" alt="" />