Be careful, you'll make him play an Ele/War
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I don't have the experience the vets in this forum do, but let me try.
Warriors, elementalists and rangers are more "common" damage dealers while the other three "support" classes have less direct damage attacks / weaker raw damage output.
Warrior, elementalist and ranger damage output depends on the target's armor. The necros, monks and mesmers however deal shadow, chaos or holy damage, all of which ignore armor (unless there are exceptions).
Other than that, how you deal the damage is important as well (as always). Melee attacks use either adrenaline or energy (they work differently) and obviously you have to be in melee range, ranger bow attacks are considered attack skills like melee attacks and spells are.. well spells. There are also different types of skills, such as signets & hexes. The type of your attack skills is quite important because depending on the type, you can be interrupted / shut down by your opponent.
Creating an effective damage dealer in GW requires you to think about what kind of targets you want to go after. Rangers, for example, have less armor than warriors, but against elemental damage they are better protected.
An elementalist might get outdamaged by a smiting monk if they were to target the same ranger.
