Having played sim games since the original Populous, I discovered Zoo Tycoon 1 as a playable game, with nice touches. I found Zoo Tycoon 2 on sale for a fiver, nothing to lose. It turned out to be the best sim game I've ever played (better even than The Sims 2).
I haven't played RC3 fully yet, and that looks *as* good, but the playability of Zoo Tycoon 2 is spot on. The Keeper mode allowed you to explore your zoo, see into the eyes of the guests, and keep your animals clean. This is the best bit, the layout and setting up of cages for the animals is easy, it basically tells you what to lay, so not as finicky as Zoo Tycoon 1.
Keeping the guests happy is relatively easy too, and the way extra items come along as your zoo gains star ratings is great too. I haven't even played the sandbox unlimited cash mode yet, the challenges are enough fun!. The only bad points - it's pretty easy, and it's fairly slow. Well, the second point you'd expect because it's a sim, and the first - well, I'd complain more if it was too hard.
This game has a great 'feel good' factor, when you've created your zoo and everything's working well. The graphics are great, first person mode is fantastic. All in all one of the best games I've ever played, with appeal for all ages and sexes. This is definately one that slipped under the mainstream radar as an all time classic.
Expansion pack out soon with more challenges and creatures. Let's hope they've shot the person who suggested 'dinosaurs' eh?