I really liked A7S as a MT, positioning, CD rotation, it was a fun fight to tank.
A8S I disliked the adds phase. It was cool the first time, but after that it was meh. The rest of the fight was well done.
A9S is too easy, but the fight is a good first fight, not as good as A5S though.
A10S is one of my favorites and I still haven't mastered it. Again its tuned too low but the mechanics and theme I enjoy right up to the telegraphed mechanics.
A11S is a T12 wannabe, I don't like it beyond the early challenge.
A12S is well done, its not nearly as challenging as A8S. The last phase is pretty cool, but its tuned so low not many groups even see it now.