Via Reddit:
http://www.reddit.com/r/funny/comments/mzm9d/up_vs_twilight/c354zbz
An excerpt:
Let's put problems with spelling, grammar, narrative flow, plot structure, etc. aside and just look at the story and, in particular, the character arc of Bella Swan.
At the beginning of the story, she is moving from Arizona to Washington on her own volition - she has decided to give her mother and her step-father some time and space and to spend some time with her father. At this point in the story, she is, admittedly, a bit of a Mary Sue, but an endearing one. She is sensitive to the needs of others (moves to Alaska for her Mom's sake, helps her Dad around the house, is understanding and tries to give the benefit of the doubt even when the other students are somewhat cruel to her when she first arrives), clumsy, out-of-sorts, and a little insecure. She's not a girly-girl or a cheerleader type, doesn't get caught up in the typical sorts of high school behavior, and in general functions as an independent person.
It's worth noting that if Tyler's van had smashed her, she would have (at that point) died as a fairly well-rounded, empathetic individual. We certainly wouldn't say she died in need of redemption, at any rate.
Instead, Edward 'saves' her - and this supernatural 'salvation' marks the beginning of a journey that ultimately destroys her.