Well, you have to grant that the ending was a surprise!
In retrospect, Twilight was a fun read, but it doesn't hold up well. When I think back on it, I keep thinking that the biology just wouldn't work -- little stuff like, "How could you spend hundreds of years as a doctor lithout a normal temperature or a pulse? Wouldn't at least one of your colleagues have noticed, seeing that is so basic to their specialty?" Also, let's face it, this is, on average, a group of mass murderers. How do you get past that in the other vampires? "Oh hi, you're one of the good guys, just go kill a couple of states away." Why didn't they use donated blood? How hard would that have been? And completely non-lethal.
Had a hard time buying into the sudden self-willed stupidity of the father.
How come, if creating a vampire was so difficult for their self-restraint, Victoria seemed to have no problem with it?
What about the sudden switch from werewolves to shape shifters? If that was the case, and they were so unique, why did all the Cullens in book two know all about how volatile young werewolves were?
And lastly, "How romantic would it be to snuggle up to somebody who was cold and hard?"
And on and on.