Black Temple - Soloable untill the essences...Essence of Desire still normal.....
Try your Combat spec? That's what my 481 ilevel Combat Rogue was and I 1-shotted phase 2.
Make sure you use Glyph of Kick
Take Preperation so you can Double Cloak of Shadows
Bring a Potion or Warlock Healthstone.
1) Start the fight, burn Adrenaline Rush and DPS hard
2) Interupt the first cast
3) Cloak of Shadows the 2nd
4) Kick the 3rd cast
5) Preperation and Cloak of Shadows the 4th cast and cast Killing Spree right away while Cloak is up
6) Drink your potion or healthstone... I know I did, I didn't wanna take a chance and die, but maybe you won't need it.
7) Kick again or maybe you won't even have to because after Killing Spree was done I think I used another Sinister Strike or two and it died and since Phase 3 is a piece of cake, I automatically win if I survive Phase 2.
Don't forget that Blizzard made these old bosses solo-able... not facerollable!
The only thing I found hard in Black Temple was the Illidary Council. I had to check a video of a level 85 Blood DK cause I wiped 4 times on the damn fight. I just followed his kiting strats and it worked perfectly for my 90 rogue.