I can see where people could dislike the whole black hole thing in ST09 if it were a proper black hole.
But I think they writers went more than out of their to say this made up element thing allows them to make an artificial black hole. Right there it is already different from anything occurring in natural space, it was never intended to be used by Spock Prime to travel in time. Turns out that was a convenient side effect that played into the story.
Personally I haven't seen anything in Trek 09 or STID that is anymore ridiculous than dylithium crystals or the Genesis Device.