Requires a lot of brain power and tactics to succeed. Aimed more on the evil side in everyone. Genial, frightening and sobering words of mine would be to describe the sense of achievement when you realize is how quickly diseases can spread in today's global world.
-1 Star because of the enormously expensive in-game purchases for special missions. If even then equal to a little more expensive selling price and include from the beginning. Am not a fan of paid DLC.