The other problem is line of sight, you are constantly being aggro'd by bats in other rooms which makes it really difficult to change target and aggro the ones closest to you.
Also, Jordan, you probably couldn't see with all those bats around you when you got stuck again in the first dungeon but, we were helping, lol, Irrek and I were drawing them off into the passage and Nik got down there with you. I couldn't as my health wasn't enough to withstand it, I would have just ended up ko'd down there again.
But yeah, Jorb needs to do a couple of bat dungeons for himself to understand the issues with those huge clusters of respawning bats, it's impossible to even move most of the time and if you are unlucky enough to get trapped by a cliff you are basically done for.
At least I kept away from the doors and we all survived.