Twilight was, for writing style, not that bad. I've read worse. But the story, well that's another thing entirely. Not even gonna go there.
As for Eragon, well I quite liked it. The second book sucked, but the series did get better (Probably. I read the last book in a twelve hour straight period, so I can't remember most of it), and was quite an easy read for a fantasy book.(Unlike, say, LotR. I love Tolkiens stories, but The Two Towers was a nightmare)
I don't see how it matters if the story for Star Wars was similar, I still enjoyed them both.
Each to their own, after all.
except the movie don't watch the movie save yourself pain