Feral spirits are fine except when they are played on turn 2 or 3 following up a tunnel Trogg. Being able to both protect and buff a Trogg is pretty gross.
Of course, that's because Tt is broken. Feral spirits is fine.
Shamans have too many cheap overload cards at this point. When an aggro deck can leave out a card as amazing as Lightning Bolt and still work, you know something isn't right.