I just cleared my first heroic Draktharon, id have to say apart from the 2nd boss (the summoner) the rest is pretty cake so long as your half decently geared.

the 2nd boss has alot of adds, and dont think he can be tanked so I had to heal my shammys a buttload, lost 2 guys but managed to just get him. Dred took about 3 go's but was just stupid healing on my part. The last guy I got 1st go with full health on everyone hes that easy its not funny. When he turns your guys to skeles just spam 3+4 on your clones which basically cast a armor and drain life. Takes awhile but he doesnt hit hard at all.

I ended up respeccing one resto and having him dedicated healer. I think the thing with heroics is just practice, i have to get in the habit of healin even when im at full.

Going to try gundrak next.