State of the game?
Mesmer; terible to level, but very viable at level 80. of the three most powerfull at PvP and very nice in dungeons and to help portal friends atjumping puzzles
Ele: Challenging and versatile. Very squishy at first, but much better later
Necro: easy to level, Nice in wvw and pvp, less viable in dungeons (although, in dungeons if you dont bring minions you should be fine)
Arise, opressed of Tyria!
I’ve only been playing a couple of months, and I have only played as a mesmer (just crafted my first ascended weapon). I can answer from a dungeon and spvp perspective.
People still post “LFM zerker warrior/heavy only!” in dungeons, but I have never really had a problem finding a group for a dungeon run. People like mesmers for our reflects, portals and such.
Mesmers in spvp run phantasm builds, or condition PU builds, or very difficult shatter builds that I have yet to master. I am not very good at spvp, but I have maintained a 50% win ratio, which I suppose shows I am not completely horrible (just half bad). I understand good mesmers are really difficult fights.
As for eles, they are welcome in groups. I have seen many people ask for fiery greatswords and ice bows, which do high damage to bosses and structures in dungeons. I think they do ok in spvp, I am not sure.
Necromancers, unfortunately, are not as welcome for dungeon runs. Some groups exclude them entirely. That said, minion masters are a terror in spvp right now, at least for me. About the only thing I can figure to do is moa morph them, which is kinda cheesy. Also, condition necros are really tough for me too.