It appears everyone on the Internet thinks Michele Bachmann debated well. Jonathan Bernstein discounts her performance:
I'm still very much a Michele Bachmann skeptic. Yes, she got good reviews last night. Also, Herman Cain got good reviews after the last debate, and Donald Trump had momentum before that. She's less implausible than those two, but next time she'll have to do more to impress, and we'll see where it takes her.
The Dish 