I've gotten used to the interface - indeed, it has many advantages - and really, AH is simply the best game in town. It's notable that any programs that used to be competitive have simply ceased development or haven't been able to keep up.
Moreover, though, the customer service is superb. Although I know that MU fans often admonish reviewers for using customer service as part of the review and rating, I think it's an important part of the overall experience. If there's a problem with a program or its interaction with other programs, then that is part of how well the program works; and if the customer service is lacking, then that will also end up being a part of how well the program works.
Yesterday, the developer took a reasonable amount of time to help me solve a long-standing problem I've had with trying to capture audio from a particularly troubling program. He stayed with me, and whereas the solution turned out to be as simple as turning off a checkbox on the troubling program, I didn't feel belittled for not knowing better. He was supportive, and I got the sense that he really takes time to help his customers.
So, good program + good service = 5 star rating for me.