Honestly, she gets a 5.
When she's not totally autotuned and when she's actually singing something that fits her voice like indie or country, she sounds fine. Nothing extraordinary, but she's not bad. She's average.
Don't get me wrong, though. I love autotuned Ke$ha. She's my guilty pleasure because of all that. haha.
There is potential in her voice and she hasn't lived up to her full possibilities yet. Songs like Animal, Goodbye or Do You Wanna Know show that and let's see what she has in store for us with her second album vocally.
Leona: 6 (I don't like her accent and her belting is weak.)
Kelly: 5 (Back in DC, she and Beyonce sounded almost the same. It was hard to differentiate the two.)
Kesha: 2