the best part is, mail gear is focused on hunters with agility. Shamans dont get Attack power from agility, so forget about that scaling element.
As for abilities, for PVE, well the numbers are out. you are trash,
for pvp, you must go tank rune on legs, the passive buffs are just so much stronger overall then shamanistic rage. otherwise… i mean, duel wield? almost a nurf giving the 2 hand spec was ironic with windfury.
as for tank shaman… you cannot even use windfury as a tank ? that makes no sense.
the writing is on the wall, if you think it will get fixed, you are wrong. as for “wait until level 40 its just lvl 25” yeah ive heard that for years “wait until next patch / expansion” and we all know how that ends… (retail cough)
If it is fundamentally broken at the lowest levels, it will either be completely broken at high level, or you might get something which is just insane and it will get nurfed and then made useless.
Use your experience and logic, already a huge buff to the duel wield specialisation was put in, which made almost no difference, is that a sign any of the shaman abilities are thought out and planned? its a bad sign, be realistic, they dont like to keep buffing and tweaking specs, its like an admission they got it wrong, and if they keep doing it, its them saying they keep getting it wrong, its just bad business.
What to expect?
Agility contributing towards attack power would be a good buff, minor but it will be helpful.
A rune with perma ghost wolfs active maybe?
an ability to wear a totem or two on your back giving those buffs constantly to a raid (would remove button fatigue, anyone playing shaman knows what its like having to use 3 - 4 global cooldowns as the fight has begun and you are still trying to place things which isnt fun before you can attack. That could be a nice buff and make you have some value to a raid.
Lightning Lash (the damaging stun) that could be good for pvp, however paladins will cry somone has something better then them so that wont happen.
I mean what can you really do now to fix it when everything is already so weak? Hard casting spells in classic, good luck! they even had to buff elemental overload as it was 3rd from the bottom (guess what it still is despite being able to wear caster gear).