Can you not BZZAPT a DPSer then BZZAPT their healer then with no more prospects of rezzing, simply pick them off? I guess pally heal and shammy heal and priest heal that makes it hard to do though.

How do you deal with warlock, warrior and perhaps priest fears with only tremors and trinket? I suppose you could rotate em.

I can see a very well played shammy group doing well. They have the burst and the survivability - a trade off for losing AoE dps but one perfect for arenas.