From Rolling Stone’s 1977 interview with George Lucas:

One interesting thing

about the music — which is sort of like the movie itself — is

that I really expected to get devastated in terms of people saying,

"Oh, my God, what a stupid, old-fashioned thing and how corny can

you get?" I am amazed that people just said, "Gee, that’s fine." I

really expected to get trounced very badly about the whole thing.

And Johnny did too, a little bit. A lot of the lines in the movie

are sort of . . . I wince every time I hear them.

And then later, "Not only a slightly corny dialogue here and a very simplistic, sort
of corny plot… Some of Mark Hamill’s lines are pretty
corny." Well, at least he’s consistent.*
* **