I’ll give it a start according to my experience.
My experience is subjective to my own perception, so don’t bother flaming me for being inaccurate according to YOUR perception.
This is from a PVP point of view:
List goes from SSS Rank to F Rank
SSS Rank:
Elementalist
(D/D basically is invincible in 1 on 1 when played on decent Ele players, while they’re still extremely strong and helpful in a team fight. 0 counter because it’s jack of all trades, master of all, with great burning damage, great survivability, great mobility, and great support)
SS Rank:
Mesmer
(The current Mesmer is God of death in any +1 situation, able to quickly spike down any target in a +1 situation with stun lock, instant burst, boon removal and such. It is also good in 1 on 1 thanks to the buff in all kinds of manipulation skills, access to cleanse currently, and long lasting instant on demand stealth. An excellent team fighter, and the most needed dps class currently)
A Rank:
Warrior
(Rampage can down a group of people in 3 seconds, while the user himself is near invincible during the process. Immune to CC, near immune to direct damage, near immune to movement impairment. The 15 ICD quickness with such an easy requirement is also kinda strong. Double Endure pain is also annoying)
Guardian
(Extremely strong Burning application. Good survivability from Mediations. Good cleanse. Doesn’t sacrifice much for such a high condition dps. Lots of classic anti-burst invulnerable or block. Currently one of the saviors against Mesmer who doesn’t run too much cleanse XD.)
B Rank:
Necromancer
(Unholy Matrax makes Necro gets life force much more easily, thus making them very durable post patch. MM Necro can troll the current burning god Guardian lol. Power build does good damage)
Thief:
(Higher burst, excellent mobility, but kinda a one trick pony now. It’s not weak, just that other classes become abit too strong for thief to handle)
Engineer
(Suffers quite abit of nerf. Condition spec becomes stronger, but survivabilty gets quite a big hit. Elixir condition spec still works, but Celestial Rifle suffers alot in the current bur sty Meta)
C Rank:
Ranger
(Kinda terrible against the current Meta, while suffering numerous nerf during the process. Too much and too easy access to retaliation on many classes. Taunt is no longer useful against Mesmer, Ele. and Guardian who has long period of invulnerable and block. Was relatively weak even before the patch because of the node restriction that forces Ranger to fight in small space. No game-changing skills like Rampage. Sustain got outlasted by Ele. Burst is inferior than Mesmer, with too much counter-play)
F Rank:
Revenant
(Incomplete class is incomplete. DPS too low, Survivability is meh. Not able to handle the current overtoned Meta)