Let's face it, we will not see the like of TOS again simply because the times are different and those who made it are either not what they once were or are not with us any longer. No matter how good a fan production gets it cannot replace or be quite the same as the original.
That said as a fan production with no one to censor them they have the potential for a great deal of creative freedom. The first story they did was essentially a safe one to do. But what would really grab attention is if they got ambitious and tried for the kind of allegorical storytelling that TOS was known for. If they pulled it off it could rock.
It would still never replace the original, but it would be a genuine tribute.