It sold a lot of copies because it's Star Wars on DVD.
Having not seen the DVD's before I bought them, it wasn't until I got home and popped them in that I saw things like the 'blue' lightsabers randomly turning anywhere from green to purple depending on the shot.
Haven't you ever been disappointed with anything? It's like ordering a sausage pizza, but when you get it home and open it, you find out it's pepperoni. It's still pizza, but not what you were expecting.