There's no debate, you MUST watch them in order of their release. Episodes IV, V and VI first, then on to I, II and III. It's important to place yourself in 1977 to understand the impact Star Wars had on pop culture and movie making in general. Watch a few good pre-Star Wars sci. fi. flicks such as Logon's Run or Silent Running and you'll understand.
I enjoyed them all, they're good films, but hype and unrealistic expectations is why people don't like the final three (Episodes 1, II and III). On their own, they're far better movies than most. Admittedly, the actors in Ep. I, II and II didn't have quite the same chemistry as the originals.
I would say Matrix is the modern Star Wars because it had a similar impact on pop culture and film making, although arguably to a lesser extent. And unlike Star Wars, the follow ups never lived up to the first one, although they were still good. If I were the Wachowski brothers, I would have released a live action version of the Animatrix movie The Second Renaissance Parts I and II. I think that would have made people sick to their stomach's in the theatre.