One of the best zoos I've ever been to, hands down. It's an amazing experience getting up close and personal with wallabies, kangaroos, emus, wombats, dingoes, and especially the koalas. It's a little out of the way (Taronga is great too and it's conveniently located in the city) but Featherdale is well set-up and even lets you buy grains to hand-feed the animals. I have fantastic memories and terrific pictures from my day at Featherdale.
Great price (especially if you can find a voucher online), not so big that you get lost but not so small that there's nothing to do, you can get real close to the animals including koalas, pat real animals, good for a visit with the family.
I just love this place and it's so close to home. It's not too big so you get to cover all the park in a reasonable amount of time, and there's lots of animals to see. You can get very close to most of the animals and take some great photos. Nice place to take a picnic lunch and have a relaxing day.