I would probably give it a 8..... it is a little time consuming to gather resources needed sometimes--- but there are so many different types of resources, and so many ways to use them, that it doesn't really become tedious like My Sims does. I thought Castaway actually simulated really well what it would be like to be stranded on a deserted island...

But I am a big Sim fan, so that probably has an effect on how much I like the game too. =)