My highest level char is 60, so i don't know anything about endgame or post 85 classes.
At the moment, my favorite is Paladin. You can do pretty much everything with it. Solo, tank, dps, pvp. Although it costs a bit much, it's a fun class to play if you know how to. As supporter, i'm finding sage is another fun class.
My least favorite class is wizard. Not all the mages, only wizard. Squishy, undefended, easily dead in dungeons and overrated as dps (a ranger or assassin may do lower crits, but they still do them way more often, and at least they have evade to survive) and even in pvp, where the only thing you can kill are fighters and the rest just finds you tasty. Besides very rare cases.