It's a perfect simulation; because it gives the user an ego of which the survival depends on the very existence of the universe. If there's a flaw; this ego will quickly try to find a reason why the flaw is not a bug but a feature. (God, etc.)

There are many limits to our universe; yet we explain them away, because if they were there; it would mean our ego's and bodies would be an illusion. Our ego doesn't like that.

Look very closely at the outer reaches of science, art and religion; and you will find cracks in this system. In buddhism, the discovery of these cracks is called nirvana, 'Moksha' in Hinduism, 'light being the fastest speed at which one can travel' in science; and the concept of 'Flow' in creative work. One can also refer to this as Egoic Death: http://en.wikipedia.org/wiki/Ego_death