Quick thought experiment:
The attacks, without attacks
Useless: Thief, Hag, Saboteur, Pirate Ship, Sir Michael
Awful: Noble Brigand, Familiar, Sir Vander, Sir Martin, Young Witch
Outclassed/Overpriced: Every other attack not mentioned including Spy (worse than ironmonger)
OK and unique: Bureaucrat, Pillage, Cultist, "Rogue" (really needs its attack to kickstart the non attack), Urchin/Mercenary
Possibly Worth Buying: Taxman, Oracle, Margrave
Strong Cards: Marauder, Scrying Pool, Minion, Soothsayer, Goons