I think this change is amazing. Sure dropping 1 nova every few seconds to stun someone and nuke was OK but it really was hard to co-ordinate. This way you drop totems, you heal or dps and if a bunch of melee sit in you you AoE.

We are looking at Magma + Nova btw. Any fire Totem. Never have to worry about which fire totems I'm dropping. Means I can drop 4 Fire Elementals and STILL AoE on top of their crazy AoE.