My thoughts:
The great:
Two birds are two strong reasons to get the pack. Even though their daytime behavior isn't super realistic, I adore the Kiwi's. I wasn't expecting to like them as much as I do, but they are probably one of my favorite animals in the game. I love their little squeaks! While the rockhopper remains my favorite penguin, the little blue is also very cute. If you haven't gotten the Twilight pack yet, bats are cool to have in exhibits. Quokkas are pretty nice. I was hoping Australia/New Guinea would get ~3 small marsupials eventually, and this seems like a popular option. The other two I'm hoping for are the Bilby and the Possum if you were wondering.
The good/ok:
Short version: The scenery is high quality but less useful for me. I don't like the devils, but I understand their inclusion.
Long version:
The scenery is very high quality, and I will probably try to work some pieces in, but I didn't find Polynesian scenery as necessary for a zoo game. It looks very nice, but there aren't any animals in the game that actually live in the region, and the only one I'd imagine coming is the Nene, which I doubt would happen anyway. Maybe some exhibit animals or birds later? If you want to make a generic Tiki tropical area, this does allow you to do that, but the theme was a bit less necessary than others in my eyes. It's a fun idea, though, and there are some useful smaller pieces and a nice fence.
The devils were popular, but I don't personally care for them. I find them scary, and their lifespan is only six years, so breeding them is a pain. Typically the youngest ones I see in the challenge mode market are 3.5 years. When you place a pair down, and one is sick, that will leave you with a short window to breed. I tend to prefer species that don't require micromanaging their population, so I can focus on building new areas. I am happy for the many people that wanted it, and a carnivorous marsupial is important for representing Australian ecology.
The bad:
No Tree Kangaroo (was a top 10 for me, and everything else was top 50 or less), but the absence of an animal doesn't generally impact my perception of a pack too much. Still hoping for a tree kangaroo and an echidna eventually.