An Elementalist, in the hand of a skilled player, Is WAY too overpowered, we all see Videos all around the web of people keeping up fights while being undernumbered, and winning without even facing too many problems.
Attunements cooldown are too short, Keep in mind they are 4.
In my humble opinion, that cooldown should be really extended.
It’s ok for a light armor to do a good DPS, but not to resist (And win) a fight against, say, 2 warrior and a guardian. It is just wrong if the opponent uses its class in an optimal way too.