These are some basic metrics for evaluating Mage performance during a raid. It's not comprehensive, or even 100% accurate for indicating skill level, but it's a useful guideline to help guilds evaluate their trials or for raiders to identify flaws in their gameplay.
Note: Some queries require the actor name to be provided. Substitute your character's name for "Dikembe" wherever appropriate.
Every Arcane Missiles! offers 5 casts of Arcane Missiles. Therefore, the number of casts of Arcane Missiles should be 5 times greater than the number of Arcane Missiles! procs. Anything less indicates that Arcane Missiles were interrupted while channeling, or wasted outright.