AI is so hard, i was making a simple game for our school's open house(this is more than 10 years ago though), just a simple top down tank combat game(i forget the name but its based on a popular NES game). I gave up on making challenging AI and decided to make it a 2 player multiplayer network game.
It's really hard to explain why, for instance, Minecraft is so processor heavy or why most open world games recycle a lot of models. A friend of mine hates Test Drive Unlimited and FUEL because of this(although there are a lot of valid reasons not to like those games) even though i explained that big games are too demanding for something like that at the moment, on consoles at least.
He also hates Far Cry 2 because it's in the savannah / Africa, he maybe watched a total of 3 hours SP(different sessions) and made up his mind, he refuses to play it for himself. He loves FC:IP though and even though we're going back to a similar setting in this game he's just not interested anymore... His loss i guess...
Guido Anchovis: On the other hand, there could be a monster, or mutants, or UFOs! This is a cartoon, those writers can do whatever they want! GT: Gier NL