I love this game, in 2 player games with my wife, I think it's about 18-2 to her, I'm not so good at the strategy!

The only bad thing is when in a 4 player game, depending on your placement of settlements and what happens right at the start of the game with road building, you can immediately find youself in for a very hard long slog and be stuck on 3-4 points knowing that you have no realistic chance of winning and are just waiting for one of the other players to get 10 points.

3 players is the optimum I find.