Honestly, as a whole, I actually kinda like this spec. I'm not big on competitive play, mostly just spend my time in PvE, and I enjoyed being an Ele swingin around a hammer. There's a few things I think could be tweaked, but overall I had fun with it.
The hammer weapon was by far my favorite part of the spec, although I feel like the damage output either needs to be increased or the range does; eles are just not built for close combat, so forcing an ele to get so close to enemies is a dangerous game and, imo, should come with a bit more reward. This weapon set feels like it could be an excellent glass cannon spec; get up close for massive amounts of damage, then maybe have to dart back to avoid getting hit. There's a few hints of that, with the air 4 skill, but at the same time it does feel a little asynchronous to have a skill dedicated to putting space between you and the enemy... on a weapon that requires close range combat. I also am not sure if I like the Earth 1 skill... it feels a bit too "busy" somehow for a tier 1 skill. The spikes erupting from the earth repeatedly is a Bit Much. Overall, though, I enjoy hammer, and can see myself using it. I like the visuals, too! Some neat animations, I like the little orbs for the 3 skills, I really enjoyed the fact that the Earth 5 skill is named Ground Pound (got a good chuckle out of me, lol). Some of the animations felt a tad reminiscent of Rev hammer skills, but eh, there's only so many ways you can animate swinging a hammer around.
The Jade Sphere... is a really interesting concept, but imo it really fails to deliver. It's got some absolutely rad visuals, but... I didn't find myself ever in a position where I could really benefit from it. It's basically worthless if you're running around in PvE by yourself, and I can't imagine having a stationary, rather small field for combos would be overly useful. I almost feel like the Jade Sphere should follow you around, giving a radius effect centered on you, rather than being a stationary field, or else should be a much bigger radius? I feel like it should give more buffs/debuffs/damage based on what element it is as well. Give it more of a use outside just combo field, imo. The utility skills all centering around the Sphere also makes them feel rather lackluster, given the small radius of the Sphere. A lot of combat is focused around movement, so having a small stationary circle where you get some stuff feels counterintuitive, especially for a class that generally requires extra movement to avoid being hit. The Ultimate skill also feels... rather pointless, imo. Cooldowns aren't really long enough for that to be a problem to dedicate a skill slot to fixing, and, again, having to be within radius of the sphere to get the boons is not ideal. I can't see any circumstance in which I would pick that over, say, being able to turn into a tornado or summon an elemental.
tl;dr--hammer cool, sphere not so much