So I love Taz'Avesh. I think it's a great dungeon from start to finish and hard mode is incredibly fun, even if the last boss is scaled so much harder than the others in the instance.
That said I feel like I should be able to bring in 8 to 10 folks instead of just 5.
I think it would fulfill another small raiding niche that we're lacking in Retail and make things more fun all around.
This is especially true for most small raiding guilds were you like the people but well, seeing the majority parse green is an unexpected delight. Suddenly now you've got a nice easy 2 hour mini-raid you can joke your way through and get some really great gear. Filling much the same niche as Kara, ZA, Malygos, Black Dragon Sanctum and even Tournament of the Crusader 10 once did.