If you have kids, it's raining, and there is nothing else to do, this is probably a great option. Unfortunately on it's own, I wouldn't really say it has a draw. The place was swarmed with camp groups and children running wild. I do not say this as hyperbole....there were literally thousands of children with very little adult supervision. I understand the Biodome people really don't have much control over this but perhaps they could space out when they sell group tickets, because having at least 10 different camp groups, takes away from other paying customers.
There's also really not that much to see in terms of animals. I think we saw one monkey, a handful of penguins, and a smattering of birds and fish. Not impressed, to say the least.