I don't agree that ranger is weak in episode 3, ranger is actually good tank and can deal a lot dmg, ranger is good. Mage i rlly don't know, for sure antimagic is one of the best skills in game but... Archer is great, mana problems you can't fix but still can be very good. Hunter is good against some classes, 1v1 will pwn archer for sure and can kill sorc and aswell, but mage can fuck him. Ele is great for farm and also that stun + heal is crazy combination, also pets are very strong in this episode. Sorc is amazing for farm, also halt and res debuff makes him very good in pvp. About critters idk rlly, i know that knight can be good tank, also if you build him right (there is some tricks :D) you can make him killer aswell. About zerk not rlly sure, don't remember rlly. Also ranger could be a critter aswell, its not bad option against some casters :D