Here is a video of a full Hyjal clear, INCLUDING trash waves, which as everyone who did the instance back at 70 knows, are as much a part of the challenge as the bosses themselves, especially the ones in the orc base with gargoyles and frostwyrms... and the wizard cleave wave ^_^
I have Shadowmourne (and don't have a guild :>), which is probably required in order to beat Rage and an absolute necessity for Archimonde. The other 3 are pretty easy regardless of your personal DPS. For the record, I do roughly 3K2~ DPS on Rage, 4K5~ on Anetheron, and 5K-5K2 on Archimonde.
The whole instance is more or less about using the friendly NPCs to your advantage and protect them as much as you can during trash waves. You'll need their DPS for bosses because they all have a 10 minute enrage timer, and if you manage them correcly you shouldn't have a problem beating the enrage timers.
Archimonde seems very easy on paper, but this time around you don't have any NPC to help you and you need to deal 2,9M hp in 10minutes, so it took me quite a large number of tries to get the spec and gear down. I tested tons and tons of specs, gear sets, trying to min-max everything. The final spec is some mix of DPS and tank gear and some weird spec which doesn't even get rune tap... do not even ask how I got to that spec. It just works. Here is the setup : http://www.chardev.org/?profile=426714
The "additional debuff" is a crystal from Un'Goro which reduces the target's armor by 200 for 2 minutes and has a 1 minute cooldown. It doesn't work as a disease and is purely a DPS increase.
The specs used are 18/0/53 and 51/13/7.
The Rasmus - The Shadows
Pendulum - Propane Nightmares
Paramore - Ignorance
Mindless Self Indulgence - Never Wanted to Dance
Prodigy - Smack My Bitch Up
Placebo - Infrared
Lucario and the Mystery of Mew - Aaron's Theme