Also, better rendering is generally better (unless you want a cartoony cell renderer). Better AI might not always be better. You don't want stupid AI bugs, but

Also, better rendering is generally better (unless you want a cartoony cell renderer). Better AI might not always be better. You don't want stupid AI bugs, but you don't necessarily want the AI to be smarter than the player. You may want an AI with a realistic character, but maybe not. Good AI makes some sense in a sandbox world, but it's not necessarily fun.