Topping healing meters does not a good healer make.
Hell, topping DPS meters does not a good DPSer make (usually).
Meter topping nonsense
First off, unless you're in an epeen swinging PUG (where these kinds of things seem to matter), total healing doesn't mean squat - and neither does effective healing, or over healing - unless your raid is wiping. Look at me, I'm keeping up JoL and healing the raid! I'm high on the meters, I must be good!
Oh, what do you mean that I wasn't doing my job. I was topping the meters! Well, yes - one of my assigned targets was dead, but OBVIOUSLY that only happened because I was healing everyone else. After all, I topped the meters!
This is exactly the same mentality that DPS get into with fights that involve target switching. One of my least favorite mages, Decius from
You simply cannot measure someone based upon a tool like recount, unless you know exactly what you're looking for. Saying that "topping the meters is the sign of a good healer" is ludicrous at best. Any fight that I want to top the meters on I'll simply run into the melee, beacon a tank, and spam HL on myself while rotating my CDs and DP for mana efficiency.
OK, so what does make a good healer?
Like I mentioned last week, you have to start with trust. Trust that your teammate will do their job, and focus on your responsibility. This is the first step in forming a cohesive healing team. Even in a PUG, you have to trust that the person assigned to heal target X is doing that job. If you spend 1/2 as much time watching what everyone else is doing, instead of concentrating on the things you're supposed to - you're going to drop the ball on something.
Realizing that not everything a healer does will show up on the healing meters is the next step towards becoming that good healer. Cleansing targets to prevent incoming damage, or to clear a polymorph, is just one of the many things you should be watching for. Instead of just mindlessly spamming your heal, look to see what other little things you can pick up. Maybe an interrupt here, or a quick Hand of Protection there.
My point is, you can't just focus on pure throughput numbers.
How do I evaluate a healer then?
This is a tough question, and I'll be the first to say that I don't rightly know.
Start by looking at who they're healing vs. who they're assigned to. Look at what spells they're casting, and compare it with their spec. Check glyphs, gems, and flasks. Look at cleansing and CD usage.
But most importantly,
TALK TO THEM
Hopefully you have a healing lead who is communicating with your healers. Find out if things feel out of control, or if they're bored because there are too many healers. Look at GrimReaper to find out how your raid members are dying, and see what can be done to adjust it (remember, you can't heal stupid).