I have one of each healing class...combat medic, sawbones, seer. Seer to me has the most utility, and the best damage mitigation of the three. It's the one I consider my main now. It just feels more comfortable to heal as a seer...or as a sawbones for that matter... than as a combat medic. I tried very hard to like combat medic healing. In the end, it just bothered me how incomplete the class seemed, to the point where I would tend to dwell on the negatives more than appreciate the positives.
Combat medics are great at what they do, and just a few tweaks are needed to get them up to the same level as sawbones and seer. Hope that happens soon.