I'm playing it right now, I started with UN3 and eventually got UN1 and UN2 but never played them. I started UN1 one day, but it was SO SLOW compared to the newer games and I didn't have the patience to play through more than twice. I still need to get through the end of UN1 and then I'll start up UN2.
i havent played ultimate ninja storm 1 or 2 yet i plan on playing the 1st one before i play the 2nd one. i own ultimate ninja 1,2,3,and 4 and from playing the storm 2 demo i know i will like storm 1 so i am going to buy it in 2 weeks