What makes a good ENC vs. merely an OK one?

[Daldaen]

Someone who is fast with the keys

If you don't have a "Cycle nearest NPC" Hotkey, set one up.

When 4 mobs arrive in camp stacked on top of each other, that hotkey is godlike for mezzing them all (or after you AE mez, to slow them or mez or root them). The hotkey however isn't classic. But I doubt they can fix that as it's a code issue.

Also someone who can always handle a charmed pet. Enchanters who don't charm are a huge pet peeve of mine. Makes me want to smack them and make em reroll a magician.

Beyond that... Someone who keeps everyone Clarity and Hasted who matters, keep yourself buffed with HP/AC buffs and runes when applicable. Never /sit next to your charmed pet, always /pet guard it away from where you are sitting. Play in a 3rd person view to have a larger field of view. Be vocal in your group, let them know what you're charming and what you're mezzing. Don't spam but make sure you are grouping with people who won't chain break your mezzes.