Evil Genius was kind of fun for a while, but it lacked something. All that individual tagging of enemies was a pain, too. One thing I did like tho, was how you could undo your digging if you wanted, and rebuild rooms/areas w/out having to start from complete scratch. Even if it was a cheesy option, the way the game was designed I can understand why they did it, and I appreciated it.
Btw, there's a massive bug regarding gold/treasury in EG...I discovered it by accident and could make millions before building any other room. :D