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I'd imagine you're not the only one who relies on critics to decide whether or not to see a movie (I hope you never relied on Ms. Zacharek, alone), and criticism is wholly subjective. I'd also imagine your friends and family who "heard it was good" heard from a critic or two since, criticism being wholly subjective, critics often disagree with each others' tastes.
That said, according to Rotten Tomatoes, 92% of critics liked "The Bourne Ultimatum." Of course, that doesn't mean that it's any good (though I suspect it is, based on the talent behind it), but it certainly indicates that Ms. Zacharek hasn't been gotten to.