One of the biggest problems was a non-functioning hybrid system, had that been working then they would have been a lot quicker and a lot less fragile on the braking front, not sure they would have been up there with Audi and Porsche of course. I for one would like to see them get the car fully functional before declaring that it's crap or otherwise!
Everyone moans about F1 cars all looking and sounding the same, variety is what makes the WEC much more interesting, and the Nissans are certainly more varied!