I agree with you that Anna is the more musical one of the two and has better facial expressions, and that Anna is massively underrated in this department. But, I wouldn't say that Alena doesn't have a natural ability to interpret, I think she does. In Stella's theme, or her Adios Noninos, or Romeo and Juliet, she'll move her hand or her head on the subtlest accent of the music, and she generally does things in a musical way. And about the facial expressions, while I see what you're talking about and Anna is definitely better in that regard, I think a lot of that has to do with the fact that Alena's first four programs were all "sad"/"intense" programs where you could get away with a serious/concentrating face. But if you look at her during Supermassive Black Hole, she's clearly performing with her face. Or even look at the end of Romeo and Juliet, she is definitely giving the sad/romantic feeling there. So while I still agree that Anna has the better facial expressions and musicality, Alena still has a good deal herself, and I'd say she's way more than "nice to watch". But I do think that Anna is one of the best ever in terms of musicality, her famous tango program when she was little and all of the off-ice routines prove that, along with her more recent programs of course.