It's a decent game that can become a bit addictive.
The sound isn't to bad, and the graphics are decent, especially at a microscopic level. It's sometimes fun to just follow one of the NPCs around and watch them go about their daily duties. Warfare is a simplistic exercise in clicking and letting animations work themselves out, and that's about as complex as it gets when you have to bury your opponent.
Anno 1701 is a similat game, but at least their is a lot more depth to the management of resources.
If you just want to relax a catch a couple of minutes of gaming, get yourself a copy of the game. If you want some gaming that will stretch the gray matter, avoid The Settlers.