Okay, I'll play (Note that this is largely subjective, although I have included the options I know to be popular even if I don't use them myself):
Warrior: Eviscerate, Triple Chop, Crippling Slash, Dragon Slash.
Ranger: Rampage As One, Trapper's Focus, Barrage, Broad Head Arrow
Monk: Word of Healing, Zealous Benediction, Shield of Judgement, Restore Condition, Martyr
Necromancer: Blood Is Power, Offering of Blood, Order of the Vampire, Spoil Victor, Spiteful Spirit, Animate Flesh Golem, Aura of the Lich, Order of Undeath, Grenth's Balance
Mesmer:Ummm...
Energy Surge, Hex Eater Vortex, Power Block, Psychic Distraction, Mantra Of Recovery, Fevered Dreams, Signet Of Illusions, Echo, Expel Hexes, Shatter Storm
Elementalist: Blinding Surge, Obsidian Flesh, Unsteady Ground, Elemental Attunement, Mind Blast, Savannah Heat, Searing Flames, Glyph of Energy, Glyph of Renewal
Assassin: Moebius Strike, Temple Strike, Assassin's Promise, Shadow Prison (PvP), Shadow Form, Aura of Displacement
Ritualist: Offering of Spirit, Weapon of Quickening, Attuned Was Songkai, Ritual Lord
Paragon: Anthem of Fury, Defensive Anthem, Focussed Anger, Song of Restoration, Cautery Signet
Dervish: Ebon Dust Aura, Avatar of Dwayna, Avatar of Lyssa, Avatar of Melandru
Interestingly, the Mesmer actually comes out with the bigger list. But that's actually something of a bad thing - while other classes mostly have a few good elites that they rely on most of the time to go with the mediocre ones, the Mesmer doesn't really have that.
I think the difference is that most of the other professions have elites that you can build an entire build off. Most of those elites, you can announce yourself as a {elite skill here} {profession here}, and people will know what you are. And with many of the exceptions, the elites are backing up some other skill, so you just need to announce what the other skill you're using is.
Mesmers... don't really have that. Echo and Signet of Illusions do at first glance, but are most commonly used with non-Mesmer skills. Fevered Dreams... is mostly relying on another profession to deliver worthwhile hexes in a timely manner, although there is the Phantom Pain/Shatter (or Drain) Delusions combo. Energy denial has reportedly been nerfed into the ground even for PvP, leaving E-Surge as basically a substandard if armour-ignoring nuke. Which leaves Mantra of Recovery - which presumes that you have a skillbar that can actually handle the increased casting rate, and even if you do it's going to be down - and hence encouraging you to stop casting - an estimated 25% of the time.
Since the OP has referenced PvP, the 'independant' skills aren't actually too bad - I'm saying this without much PvP experience at all, but it's a lot harder to say that Broad Head Arrow makes Mesmer interrupts redundant in PvP, and my understanding is that enchantment and hex removal is more important in PvP and thus elites that provide those are that much more valuable. However, when push comes to shove there's no Mesmer elite that I can think of that has as impressive an effect on a build as, say, Dragon Slash does on a Warrior.
Although I must say I actually find it easier to find a good elite to serve as the capstone for a Ritualist build than a Mesmer one nowadays.