While I agree that Skyshrine armor is largely out of date (Duh! There have been 5 expansions since this came out), these are still nice pants for casters. Leg slot is one of the toughest to fill, and 40 mana is a nice amount for that slot.
HoT is also one of the best places for younger guilds to learn raiding techniques and thus is still a worthwhile area to go to.