A little help please...

Ok I was going to stay away from the Twilight series because everyone loves them so much (and I was trying not to follow the crowd) and mostly I just knew they would be addicting and take over my life. But I was out of things to read so I gave in. A week and three books later, I am feeling very confused by everyone's obsession with Edward Cullen. Someone please help me out here! I think that he is a very under developed, one-sided character. He doesn't seem to have any depth or personality. Does Bella love him just because he is beautiful? When did they fall in love? Did I miss that part of the book? It seems like one minute he wanted to drink her blood and then next they were madly in love with each other. Does he love her because her blood smells good? I just don't get it! If you have any insights I would love for you to comment and tell me them.