Emma has a short review of the first episode of Once Upon a Time. She focuses on the creative side, so I'll add two general observations:
1. Once again, Disney is plundering the public domain. Which would be perfectly fine if Disney wasn't actively restricting the public domain to keep their copyright on Mickey Mouse.
2. While I think it's extremely likely that Fables inspired Once Upon a Time, the idea of updating fairy tale characters is ancient. Objecting to the updating of fairy tales misses the point: old songs and tales are constantly updated to keep them relevant. (Frex, the differences between British and American versions of ballads are fascinating. Well, if you're the sort of person who's fascinated by things like the removal of supernatural elements from ballads.)