I think she redeemed herself when she redid this on Jimmy Kimmel. This one goes frequently off key, and the breathlessness is distracting. Around 4:08 when she tries to wrap it up, I think she realized she botched it because it wasn't as enthusiastic as the JK version. (she smiles at that point in the JK version)So I'm not going to lie and say I liked this version, but hey...everyone has bad days. It's not an insult to the singer, just trying to make an honest review.

I watched the video, never having seen/listened to any of her other work, and I rather liked it. It was earthshattering by any means, nor was it the equivilant of torture. It was different though, and that made it interesting. I can easily see myself listening to more of her music.I did find the Kristin Wiig parody of her hilarous though!

Well, she doesn't sound like your typical mainstream, upbeat, uber-hype-pop for sure.
But that's part of what makes her sounds attractive to the rest who aren't into the above mentioned. I really enjoyed this version, she played around with her voice a lot when she sings this time.

As a singer, sure, I saw that she was a little out of breath and that she couldn't nail all of the songs high notes with castrati precision, but thats not the type of singer she is. She's a depressing alternative to mainstream pop. She is singing live without the assistance of autotune, backup singers, heavy instrumentation or he own pre-recorded vocal production.
Every performance is different and it is refreshing to see a live act with so many things in it that people consider to be mistakes. It all depends and every show is different. I think she worked through her performance well making it one of the most interesting and stand out performances on this show.