Perhaps. I've got a Ranger and Cleric and added the hentchman mage and warrior. So far it's been pretty balanced.
I could do the orcs ... if they didn't fire those crossbows that blow me to kingdom come. The king skeleton and his queen would be doable ... if he didn't summon four others into the fight. The guys walking around in the fire ... level 8 and no way. I did get the wolves finally, and the skeletons with the poison boars, and the undead pyro mage and his elementals, cleared the rainy area, etc. But I can't seem to get the rest and was wondering if there was just something I missed.
