Really? Wow... I'm a level 11 Mage and had to really strategize to get through it (I accidentally fell off the ledge into the first pit and was assaulted... my Atronachs didn't stand a chance). I still have poop stains on my undies.
I'm playing a spellsword, and at the time a single ...bug i could take, but not if it had friends of any kind. The areas with many of them required some running away and a lot of ranged attacks. The ...boss at the end i had to kill from the ledge so it couldn't hit me with melee attacks, as that would have been one hit kill. I had magic staffs in addition to spells to help with ranged attacks, and one rank in "bone crusher" that helped getting trough the regular bugs armor.
Not easy, but very entertaining

Next time i'll try to clear a dungeon with a Dragon Priest at such low level. Maybe Ragnvald, as that is easiest to reach from a town.