So far I like Gotham a lot, i like the re-imagining, and to be honest there really is no canon in the DC universe. They have done two full reboots, plus numerous partial reboots over the years, so that no character has had the exact same origin. At this point 90% of the stories pre 1985 are no longer canon, they just never happened.
Look at Wonder Woman: 40's Amazon, 80's sculpted clay baby magically imbued with life by the female goddesses of the Greek pantheon, current daughter of Zeus and a mortal woman.
Don't get me started on Hawkman.