Count me in on the "hate" it wagon. I can appreciate trash novels (I wouldn't make it through a week at the beach without them), but I cannot imagine how such a poorly written series has garnered such attention.
Most of the PP's have already expressed the problems with the themes & writing that drive me crazy with this "obsession."
- The whole Mary Sue situation is enough to make any fan of literature vomit multiple times.
- Edward, regardless of his looks, has a lifetime of experience in how to mold/seduce women. He is, essentially, an old man seducing a young girl.

- The theme of wanting what you love, regardless of consequence, is a very dangerous theme to be disseminating to the audience (mainly young girls) who are at the very early stages of understanding how love/life work.
- The repetition in the books is ridiculous. Yes, we learned Edward was beautiful the first 8000 times you wrote it!
The list could go on and on...much like the pages and pages of useless text explaining Bella and Edward staring at each other.
So, to the OP, you are not alone in your bewilderment about how such a poorly written series became such a "craze." There are plenty of other vampire tales that are superior in content and in their writing style. I always recommend the original Bram Stoker's Dracula to "Twi-hards" and most are astounded as to how much better Stoker weaves his tale, when compared to Ms. Meyer.