With DPS, this question is simple. You can take a glance at your damage meter of choice and see how much damage they've done, perhaps combined with how much damage they've taken (hitting the top of the damage meters may be impressive -- but if the only way to do that involves being a major drain on your healers' mana, it might be better for your group as a whole if you cut back), and can have a pretty good idea of how they're performing. On the other hand, measuring a healer's performance is a bit more ethereal, as discussed in depth today on Priestly Endeavors. Of course, you can watch the healing meters, but they don't tell the entire story of a good healer. What about mana management? The 5-second rule? Heal timing? (Heal too soon and you're overhealing and wasting mana -- but heal too late and you may not have anyone to heal at all.) Kirk on Priestly Endeavors breaks it down into the data you'd want to see to completely determine healer effectiveness:
- The health of every party member over time.
- Information on every heal that was cast and when it was cast (including things like Power Word: Shield which usually aren't counted).
- The healer's mana over time.