I have them all maxed so how about an arbitrary tier list based off my own personal enjoyment of the class both in PvE and PvP (Not numbers or overall popularity).
S Sge, Whm, Smn, Nin
A Pld, War, Mnk, Vpr, Blm, Pic
B Gnb, Dnc, Rdm, Blu, Brd
C Drk, Dgn, Sam, Sch
D Mch, Ast
F Rpr
add a skeleton here at some point
about 1 month ago