CGI does not age well, I cant remember what its called, but the theory goes that something which looked great 5 year ago, will look terrible when you watch it again, as you will have seen more recent CGI which is better quality. I am going to approach it with an open mind, if its good, fantastic, if its not good, I can still enjoy the ride without the headset.
I am thinking a lot of use will be wanting to go on it the second time without the headsets on anyway to have a nice overhead view of Nemesis after its repaint.
I also think they picked the wrong technology and wrong ride, although I do think they have picked the perfect theme. How cool would something like Microsofts Hololens on Duel be? Zombies smashing through doors, the giant spider crawling over the ride car. I think this works for rides like Duel, but not for Rollercoasters.