GW1 was dual classed, and I typically played a Mesmer/Necromancer (or a Necromancer/Mesmer) with a focus on debuffing and/or anti-caster. The thing I loved so much about the Mesmer skills, particularly, was how indirect they often were. The GW2 Mesmer design tries really hard to have the same feel. They have lots of skills that apply the confusion condition, which makes the target take damage whenever they use a skill. Between those skills and the clone guys, the Mesmers are still focused on denial, but I just haven’t gotten the same feeling out of playing them in the new game. Once the utility skills and traits start unlocking so I can really design a build instead of flailing, I think they will come into their own.
That said, I’ve primarily been playing a female Norn Guardian (Em Biggund). I am usually drawn to support classes, and the Guardian (or maybe a water elementalist) is the most support-y class that GW2 offers.
For each class, the function keys do their special class thing. Thieves teleport to their target and steal; mesmers explode their clones and do one of 3 effects; elementalists switch their elemental attunement.
For Guardians, they control three Virtues – Courage, Justice, and Resolve. They are normally passive, letting you set a dude on fire every once in a while, auto-block an attack every once in a while, and giving you a slow health regen. When you activate, them, though, they instantly give the bonus to you and everyone around you, so you can really turn the tide of a battle if at the same time you and all your friends heal, set your target on fire, and block the next attack directed at you.
I usually carry Mace/Focus and a Greatsword. The Greatsword is mostly for doing player-centered AoE damage. You also get a leap attack and a multi-target root. The Mace/Focus is more support-oriented. You get a player centered AoE that heals you and hurts them. You put up a shield around you and nearby allies that blocks one attack and hurts people around you (or, if you don’t get attacked in 2 seconds or so, it gives you a protection buff). You get a “ray” that bounces off several people, hurting and blinding enemies and healing and buffing friendlies. And you get another shield that blocks 3 attacks against you or blows up and hurts people.
My utility skills at the moment are based around pulling debuffs off of my allies and then turning them into buffs on me. Oh, and my heal is a cone that heals me and whatever allies I’m looking at.
I have found the Guardian to be great fun – survivable and effective in PvE, and I can actually feel like I’m contributing in PvP, even though I suck.