Holosmith, a class that manifests holographic light weapons is the hottest (heh) class I've ever played in an RPG. And the visual effects are just chefs kiss.
Pistol/pistol condi flaming mech, feels like I do stupid amounts of damage and no real problem surviving by just dodging intelligently. Then I go to wvw and get shat on.
I really like virtuoso. The animations of shooting daggers feel very good, it is very flexible with quite a few defensive / sustain options, can swap utility slots for... utility... The rotation isn't set in stone, etc. Chrono has also been very fun recently with the continuum split shenanigans as well.
But I'm not quite done, making up my mind, after the Weaponmaster Changes, since how a spec plays/feels often depends a lot on which weapons it uses and hence which stat sets are valid.
E. g. I like Greatsword and Longbow on Guardian which more or less determines the stat set (power damage) and a general play style (offesnsive, bursty, high risk+reward). I'm currently running this as Dragonhunter, but maybe it works even better or is even more fun as Willbender.
Other professions, e. g. Necromancer, are mostly defined via their class mechanic which changes dramatically with the chosen Elite, i. e. the weapons don't matter much when you spend most of your time in Shroud anyway.