RDM and Diversion/AoE

[Rongway]

Secondly, there can be 4+ mobs on the screen, yet so many single target. Is RDM aoe that bad? Is single targeting better even when there's about a dozen mobs onscreen?

At exactly three targets, a mixed approach should be taken, as Rawrz explained. Scatter-Verslowspell-Scatter-Verslowspell. This does the same damage as Scatter-Scatter-Scatter-Scatter but generates more mana for Moulinet.

At four or more targets, Scatter spam does more damage.

Here and here are maths.