hahaha...this debate will always be an endless topic to discuss. while i dislike making some rankings since it depends on gears, skillsets and playstyle, i would like to establish some tiers. classes on the same tier has equal in power (this is also debatable, but to simplify things up):
god tier : Gene, gx, rk, ranger
high tier: sura, mechanic, sorc, RG
mid tier: performer, warlock, rebel
low tier: sc, kage/obo, suno, AB
dunno why people always underestimate performers. SR is really great skill to have, i myself often MVPing with my performers and it is effective. moreover SR posbug already solved, so hit and run SR method now available, making things easier
SC can be up there in high tier