I just started messing around with Fire yesterday and found out that a Fire El/Me has one of the strongest single target nukes in the game, especially vs high end mobs. Thought i'd write it here since i never see it in any build:
Fragility + Immolate. It adds around 40-50 clean damage every time you immolate someone which is really good damage vs high end mobs or warriors/rangers in PvP. It makes Immolate do overall over 100 damage (let's say 44 from fragility cause i don't think most will max a secondary skill, 42 from immolation and the rest from direct spell damage, so can do over 130 on caster types) most of the time which is awesome for a 5 sec cooldown 10 energy skill, it's comparable to Lightning Orb (actually better vs warrior/ranger types).
Fire eles out there should try it out if you want to be good vs single targets as much as with AOEs!