Well the environmental aspects were good but how will they handle people in general. Are bodies going to continue lying around and decaying like a normal world would do? Will damage to another player or monster or what ever you fight in it be correctly rendered or will it be enhanced, impossible and excessively bloody? That engine is proprietary so if it is so great can it handle other game formats?
Gaming parameters are now entering the realm of true virtual reality. Welcome to the Matrix anyone?