A case (like "Ordinary People") where winning the Oscar hurt the film
If it had not won, there would not be 1/100th the hate swirling around the interwebz about this movie. And it really doesn't deserve all the mud thrown at it. The people who made the movie didn't vote for the Oscars.
Personally, I saw all the nominees that year except Capote, and I thought Crash was better than Brokeback Mountain, Munich, or Good Night, and Good Luck (although there were two non-nominated movies I liked better that year: Nine Lives and Conversations With Other Women). But even if you don't agree with me about the movie, to act as though it was the worst movie of the year, or the decade, or of all time, is absurd. Even to act as though it was some kind of remarkable travesty to give it Best Picture is silly. Most Best Picture winners are dubious at best (and in my opinion this wasn't one of the dubious ones).
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My top 250: http://www.flickchart.com/Charts.aspx?user=SlackerInc&perpage=250