I've only done one playthrough of each class story and two expansions but so far:
>God tier
Imperial Agent (DS), Sith Inquisitor (DS)
>Great tier
Bounty Hunter (LS), Sith Warrior (LS), Smuggler (LS), Trooper (DS)
>Good tier
Jedi Knight (LS), Shadow of Revan
>Weak tier
Jedi Consular (LS), Rise of the Hutt Cartel