We have only played this with two players so far and it is a blast. Lots of tactics with two, and I'm sure it would be a great game, and different with more. I have played this multiplayer a fair maoutn now and it is equally fun with more, though less tactical.
This is a very fun game when you don't have a lot of time, and it doesn't impinge on the marital bliss the way some other two player games do. The online tutorial with Prof. Easy is helpful if you are confused about how to lay tiles. I definitely want to purchase Entdecker.