ETA: I apologize in advance for how long this is. Didn't realize how winded I got!

To me, Mya is really, really good. But, BORING. I agree that I don't know what it is, but to guess, she just comes off as a very good technical dancer without much else. No real emotion.
While I'm all for putting your own twist to the dances (you have to), you can't go overboard with it until the dance isn't even recognizable as to what it was originally supposed to be. She, and Mark at times, are especially guilty of this. They are both fantastic dancers, but they put SO much added stuff in there that it almost seems like a lack of appreciation, even respect, of the dance itself.
This is supposed to be "ballroom". Put a twist in there, personalize it, but don't change it so much that it looks like nothing more than any other modern dance out there.
Joanna is really good. But I can't remember any really fast dances she has done. I know she has to have, but I can't remember them. I only remember the slow ones. She has elegance that is perfect for that type of dance. Can someone remind me of the more fast dances she has done?
Michael puts his whole heart into every dance. He may not always do well, but he throws himself completely into it. I can't help but respect that.
Kelly, God bless her, is fighting her own personal demons through this process. I see her being weak at times and having triumphs at times. She isn't the best there, don't think she should win, but I can't help but to root for her on a personal level. Whatever the outcome of this show for her, I hope it raises her confidence in herself. She has proven she is capable of SO much. I want her to take it to heart and use it to strive in her life for whatever it is she wants to do.
Aaron is cool, a bit cocky, but cool. A bit on the fence with this guy. He's kind of just, well, heck, I can't decide! LOL. Not someone I root for or against. Just.... eh.
Then there's Donny. He's good more often than not and he brings such a work ethic to it. He gets dramatic at times and sometimes I kind of cringe, LOL, but yet, I adore him for it. I have noticed that after all the hoopla he can do, he slows down and really "listens" to the judges. He takes their comments and uses them in the following week. He struggles harder than some, then finds it easier than others. He probably is, truly (on a technical front) middle of the pack. But to me, he knows when to have fun and then when to take it very seriously. He has the correct balance and puts technical moves and passion into every dance he does.
He may or may not win, but he is my choice completely.