As Entropia already mentioned, you really should be using Healing Stream as resto. Strategic use of Mana Tide and a good amount of spirit/crit will keep you from going oom... also make sure your water shield is always up.
On the topic of resto shaman... I'm really disappointed with the current state we are in. With the recent buff to discipline priests, we are now ~20% behind everyone else. Our single target heals are pitifully weak in comparison to our counterparts, our mana efficiency is the worst, our mastery is highly situational, and we lack any meaningful cooldowns.
They need to do an entire revamp, starting with the antiquated totem structure. It has no place in today's game.
On the topic of resto shaman... I'm really disappointed with the current state we are in. With the recent buff to discipline priests, we are now ~20% behind everyone else. Our single target heals are pitifully weak in comparison to our counterparts, our mana efficiency is the worst, our mastery is highly situational, and we lack any meaningful cooldowns.
They need to do an entire revamp, starting with the antiquated totem structure. It has no place in today's game.