I've sat through bad movies. The most recent Batman movie comes to mind. I've sat through boring movies. Lost In Space comes to mind. I've sat through movies with awful dialogue. You've Got Mail comes to mind. But there is something about She's All That that elevates the film above mere crap into what Fredrick Nietzsche called the overcrap. There is no real redeeming value in this film whatsoever. It's paint-by-numbers all the way.
Start with the casting. Freddie Prinze Jr., while attractive to the ladies, is an awful actor. He seems to think his job is "stand here and look cool right?" Rachel Leigh Cook, on the other hand, is at least solid in the acting skills department. However, she seems woefully miscast. She is simply too pretty to really understand what it is to be an outcast. She probably used some sort of anecdote about not being able to sit at the popular girl's table in the 7th grade to "inspire" her. From the moment you see her, you know she can be made into the prom queen, because she isn't weird-looking or fat, nor does she have any characteristic of an outcast aside from the clothes. Others are brought in and given nothing to do. Matthew Lillard, the actor I consider to be the white Chris Tucker (just wind 'em up and let 'em go, they do the rest) is given a part that does not fit his underappreciated comedic skills. Usher Raymond and Little Kim are given nothing to do either, as an inordinate amount of screen time is given to the prom-queen in waiting (her name evades me) who simply cannot act her way out of a paper bag. Alas, poor Kevin Pollack also gives the worst performance of his career. It's a shame really, the guy is an unappreciated actor and deserves better material than this. The film's script is awful as well. While the whole cinderella-type idea the film is based on (take the freak and make her prom queen) is enough to support a film, albeit barely, you need real DIALOGUE to make it work! Lines like "thank you" after having a drink poured down your dress simply won't cut it. Especially embarrassing is the scene where Kevin Pollack's character watches jeopardy. Yes, the man is supposed to be rather unintelligent, but the scene is quite simply cringe-inducing. And why would a 12 year old be skating around a cafeteria putting fresh-ground pepper on Buffy Sommers' plate? Wouldn't he have school to go to as well? Never mind the nonsensical final scene. He couldn't graduate dressed like that period!!
Don't waste your time with this. Go for a walk instead. Spend time with your family. Next time you see this in the video store, smash it with your heal and go rent SLC Punk. You won't regret it.