I surprisingly liked Earth One. I had zero hype for it initially "ANOTHER Batman origin story?" but have done a 180 and am now awaiting vol 3. But with Johns tied up with Watchmen, I'm going to be waiting a long while.
Gotham season one definitely felt a bit like Earth One, mainly with Alfred being a badass. Gotham takes a hard turn from kind-of-sort-of realistic into more fantastic, sci fi territory. I liked the original tone a LOT more.