As a girl, and a geek, I've found that the girls who are into Twilight tend not to be one of us. I have tried to read Twilight, I got about halfway through the first page. Of the people I know who have read and enjoyed it, and they are few, , the attraction is pretty clear- Bella is a Mary Sue, yes, but she is also written so as to be so devoid of actual personality in such a way that the reader can quite easily insert herself in over the top of the character. It's an escape, to a world where an outcast is suddenly adored by everyone, and has an amazingly sexy guy with the body of a Greek statue to worship her. I find what is says about those people sort of depressing and I tend to judge them, purely because of how obviously sexist and downright creepy the book makes Edward and Bella's relationship. If you're interested in a thorough exploration of all Twilight's issues, then I direct you to this site:
http://twilightsucks.proboards.com/index.cgi?board=twilight&action=display&thread=638
So, since I avoid Twilight like the plague, where, you may ask, do I get my gratuitous male objectification? Why, True Blood of course. It's the show of choice for the modern woman who likes her bloodsuckers sexy, but with interesting personalities, and accompanied by female characters that aren't all completely useless, and some of whom (Pam, Maryann, Jessica) are actually pretty damn awesome. Oh and it has plot, something that Twilight strains towards, and pretty much fails to actually grasp.
If, like me, you've tried to read Twilight and failed, or never tried but would still like to know what it's about, fear not! This guy:
http://markreadstwilight.buzznet.com/user/journal/4400301/mark-reads-twilight-preface-chapter/
read Twilight and New Moon, and is currently reading Eclipse, so that we don't have to.