Photo from: http://www.daysofwonder.com/smallworld/en/
Each scenario has setups for 2 - 6 players, each providing a vastly different game. Check out some of these cool maps:
Photo by: GeekInsight
1. Endless Replayability
2. Scenarios add a new dynamic to the game. Some involve starting from one end of the map and others challenge you to capture and hold objectives to earn more points.
3. Quality of components. The art is fantastic, the cardboard is solid and the bits match up to the quality of the core sets.
4. Fun factor! If you liked Small World, this ramps up the fun factor big time.
Not so Awesome:
1. Setup time increases significantly. The tiles are labeled with letters (normal on one side, and strange italic font on the other side), but they are difficult to tell apart. Some scenarios will take as long to set up as it does to play.