I could be wrong about this but I think Elemental Burst might need to be rebalanced as well. I wield some pretty good items on CetraNova for optimizing fire/ice damage at a good casting speed and leveling up is tough. Right now, she is at lvl 22 and has difficulty with many mobs due to their higher ice/fire resistances. The cooldown is a bit long and the cost is high in my opinion. After spamming (at a somewhat slow rate) ele burst, my 330 mana is depleted pretty quickly and i'm only doing around 30 or 40 dmg at most to enemies. So on average it takes about 4 or 5 casts to kill things, eating up about 70 mana just for a single target. I have tried "hearding" or "grouping" the mobs together for this nova but because of it's shorter range, I often die trying. This is because as a typical caster (and to afford it's high mana cost & low damage) I have put ever point possible into power. This leaves myself and most other casters with low health with many many many levels to go until level 30 before FINALLY getting mana shield.
This is another issue that might deserve a rebalance also. Should casters really have to wait until lvl 22 for mana shield? Rampagers and Huntresses are able to sap health back quickly with leeching ability and Shamans are able to avoid damage by having lots of minion meat shields available but elementalists only have 1 real reliable defense mechanism, mana shield. Sure there is frost shield (and poisonskin if added) for damage reduction but to keep casting speeds, mana regeneration, elemental masteries and other necessary skills up, there really aren't any available skill points to use it with. I probably wouldn't use it anyways since the duration is low and i absolutely HATE rebuffing every 30 seconds lol. Realistically though, mana shield is the only defensive skill that we look forward to having. As a mid-lvl caster, I think that it's virtually impossible to survive among the mobs in the newer areas without it (or a group of ppl to clear a path). I'm scared to even think how much mana I would have left for mana shield anyways after using it all up to cast elemental burst a few times. Anyways, these are some areas that I thought could use some improvement. I'm not sure if anyone else has played with this skill at all, but I would love to hear some feedback from someone else if they have too.