One thing I really thing should be addressed and this is just me is the type of gear that's shamanable.
I've had a few legendary shamans in the past. The one thing I liked to do on my shamans is load up a vicious mithril axe, put a thief spirit in it and run around with 8-10 leather damage items. With damage so easily worn on a shaman(almost all thief items, wrists, rings, waist ect) and the ability to be wielding a two handed weapon, it just gets ridiculous. 10 damage on top having the ability to frenzy and 2x hit, on top of spells that buff your melee on top of having 5 spirits on TOP of having regen and healing wave. It's bapting outrageous what a shaman can do. Now I know many people play their shamans differently, valuing +slot and +healing done gear but the real focus on shamans should be what direction you want them to go in. Do you want them to be pretty much a melee druid with mediocre heals or just a regen/heal/spirit bot. Right now they can just do way too much.