It would have gotten all five stars from me if it wasn't for the entry fee. I remember going as a kid and they charged a set price for the car load, now they charge per passenger.
I haven't been here since they got the giraffe, and the last time I went it was raining, but it was still a good time. We had a lot of fun feeding the little birdies. Be warned though, the birds can get a little Hitchcock-like. If you have the food, they fly around above close to your head, land on you (your arm, hand, head, whatever) and one of them bit my finger.
The drive through is pretty cool too....they offer the narration on tape and CD and it's not like at Disney; you're guaranteed to see a lot of animals.