I have 2.2 in 2c, and 2.2 in 3c, and i can easily say:
3)Maelstrom Weapon : this is far more important to be addressed for than every other bugged ability, because on this one lies the survivability of the entire spec. The problem with it is that the proc chance is lower than it should be. In a duel or so, in like 1 minute fights you will hardly get all the 5 stacks you need to heal yourself, or to deal damage with elemental blast. The stacks are hard to get even if you reforge full haste. I didn't find any reliable source to what the proc rate should be, although on Wowwiki, it's shown that should be around 25 ppm while dual-wielding http://www.wowwiki.com/Maelstrom_Weapon
-Falce. I have 5 stacks 95% of the time in the arena. ~2 used GCD's = 5 stack. Tested by myself.
4)Ascendance: enha most reliable thing to carry in PvP in Mysts of Pandaria is broken, yes. I don't know for sure what's the matter, but the thing for sure is that Stormblast damage and auto-attacks damage (Wind Lash and Wind Lash Off-Hand) are lower than it should be. To test out these claims, you can compare enha's Ascendance auto-attacks damage to the damage of rogue's Shadow blades ones. In fact the damage seems equal here, but it shouldn't be like that, for two reasons:
1) shamans equip 2 slow weapons of 2.6 speed, while rogues have 1.8 speed daggers, this means shamans auto-attacks should do more damage per swing than rogue's (attention: we are talking about auto-attacks while in Shadow blades Shadow Blades and Ascendance, so armor is ignored!)
2) shamans have mastery that increases all the frost, fire and nature damage dealt, Mastery: Enhanced Elements, and, seeing that auto-attacks in Ascendance deal pure nature damage, they should benefit from mastery!
-Falce too. Spell works blizzlike. All spell, with autoatacks. Tested by myself.
2)Searing Flames: this passive ability is even more crucial for enha than windfury.
The problem with this ability is that the stacks are generated upon searing totem bolts hits, but the damage of Lava lash is not increased. For every stack of searing flames, the damage should be increased by 20%, for a total of 100% increased damage. In my opinion this ability should be on high priority, because almost all the damage outside burst for enha comes from Lava lash, and right now, it hits like a wet noodle.
PS: The stacks are generated for resto and ele specs too, isn't that important, but it's still a bug.
-And this falce too . 5 Stack give 100% more damage to lava lash. Tested by myself.