I'm not quite 50 yet, but been having a lot of fun with my combat medic. I have never had a heroic group with a real tank. It's always me + 3 dps, and it gets crazy with the entire group taking damage all at once, everybody tanking their own elite, and I'm usually tanking a mob or two the whole time I'm healing because nobody pulls aggro off the healer anymore. Insane games of whack-a-mole let me tell you. But I get compliments all the time for "Nice heals" etc. so that's always cool to hear.
Anyway, I am rambling, but it's a fun class at least at my level