mesmerize paralyzes the mob until it is hit.
You use it for crowd control....ie: when dealing with adds (one that came, you didnt pull). Use it when grouping...it's not somethign you can use solo (you will have a teerrible time trying to cast mez with mobs beating on you). It basically puts the mobs to sleep for a period of time, while your group concentrates on the mob you actually pulled. Fair warning, however, they are VERY grumpy when they wake up...and they are grumpy at the one who put them to sleep (ie: you).
Edited, Fri Mar 15 17:06:16 2002