I feel you ... with my mate the disc priest i did a random hc on my main ele shaman. We get a demo lock, boomkin and pally tank. Pally is in #1 horde guild and is an alt that goes 10/12 hc 25m each week (for some reason we could only do random's with people from our own server tonight, lots of random dc's, getting booted from the dungeon, etc). Anyway, halls of lightning. Tank chain pulls first trash packs and gets nearly killed 2 times, if I didn't help with the healing it was a wipe. And he dc'd. So we wait for new tank, and after 10m we decide to clear next pack of trash. 5 seconds and it was dead. So we go for boss. 10 seconds and all full health. We clear our way up to 2nd boss, no prob whatsoever. We cleared whole instance with 3 dps + healer and had zero problems at all. So we decide to queue up for another one and get FoS. Pally tank we get dies on 2nd trash pack and leaves. We continue and clear the instance in record time, again 4 manning it without the tank. Except for the last boss we didn't have a single dead (i didn't have dbm installed and kill the lock by accident).

So yeah, looks like they'll have a hard time ...