Some data to fill in the gaps in Armok's: I read Twilight with an effort to have an open mind about it. I slightly enjoyed the first three books as romance novels, then the end of the fourth was utterly worthless. Then I noticed the ideas behind the first three books, which were bad. So the series in general is ok, but only if you don't look at it very hard (Luminosity, on the other hand, is good).

I haven't read the Koran, but the scattered parts of the Bible I've read were relatively boring. There are a lot of rules, procedures, genealogies, and distorted history that are really only of interest if one believes the religion.