I do hope that, over the course of her career, Stewart gets to be remembered for something on the same scale of exposure as Twilight, only, y'know, good. Yes, she sucked in it, but even the best actors or actresses are going to suck when they have to work with a shitty screenplay, adapted from shitty source material, and with shitty direction. As someone who's passionate about performance myself, I can hardly blame her (along with the rest of the cast) for completely phoning it in and looking like they'd rather be in anything else than those movies, but for many of them it was their big break, and nobody, no matter how talented, can afford to turn down the first opportunity like that you get, or you're never going to get a second one.
Shame the same cannot be said for Robert Pattinson. He sucks in otherwise good movies as well.