So far, I've cleared 6 bosses in total with my friendguild on 10 man. Among the 3 raids I've experienced so far, Bastion of Twilight is my favorite, beacuse it's a bit more like, you really need to kill this boss to move on to the next. Blackwing Descent is ok, but it feels like a small ICC to me. It's not the same artwork or such, but the overall design of the raid feels a lot like ICC, like you can chose which "wing" you want to enter first, which feels a bit boring to me. Throne of the Four Winds is a bit bland. It's basically just 5 small platforms with bosses on them. Together with some bland loot, it has to be my least favorite.
I dont count Baradin Hold as a tier 11 raid, I count it as a lootpond, where you fish up your loot after some struggle with a fish... or something.