If you look at the tactics:
Gara'jal
Elegon
Feng
Stone Guards
Wil
Spirit Kings
If you look at the dps requirements:
Stone Guards
Feng
Elegon
Gara'jal
Spirit Kings
Wil
Outgearing a dps fight is much easier than outgearing a certain tactic. Gara'jal und Elegon became very easy with gear but were hell during the first lockouts. Stone Guards instead don't require that much dps but a perfect execution of the taunt rotation.