Q:
Fire build
Not viable, sadly. The Elementalist relies on all four attunements.
Single attunement should be fine in PvE. I’ve done it and it’s not bad. However, I did use a conjure weapon of the same element when I needed more damage.
Fire would focus mainly on damage.
In PvP, I’d say it’s better to use all four attunements. It’s a lot easier to deal with opponents when you have CC skills available from the other elements.
I found a few fire builds at http://en.gw2codex.com/. Not sure if they are any good though.
(edited by Artifect.9647)