It was fun, but a little too short...not much content.
It would have been good if all of the new features were available for play in the regular game. This could include adding all of the new features into the old scenarios. Also, the game needs to have simple skirmish levels: allowing you to play a map without following the main story line. This would add to the gameplay and replay value.
In closing, a good addition that could have been better, but at it's low price, it's worth getting to experience...