Meteor Swarm tends to be more of a NPC spell than a player spell, along with curse.
I find it funny that if hardly any player uses a spell thats unpopular, the NPCS use it most of the time(I.E.:Shroud final boss uses meteor swarm a lot and kills the heck out of the party, Kobold mages use curse on elite, exc.). Of course, the popular spells that players use can also be used by NPC'S, but it happens less frequently than the other mostly unused spells.