To those who are saying the game is hard, yes it is. BUT while it's tempting to play sandbox first, it's best to go through the campaign first. It covers most of the aspects of the game. For the things I couldn't figure out through the campaign I researched.
The graphics are brilliant and the game is smooth. The care and detail that goes into the needs of the animals as well as the world overall is astounding. The learning curve is VERY steep yes, but if you enjoy a challenge I would say it's for you.
Personally I'm addicted. I've been playing for around 6 to 7 months now and have learned a lot through just experimenting on my own. I really enjoy this game and look forward to further updates.