My experience is that generally an overly revealing trailor (have you ever seen the trailer for Seven Samurai? It practically says "and at minute 67:23 so-and-so dies and then at minute 93:14 this other so-and-so makes this important decision") doesn't do anything to ruin a good movie for me.
But they do go a fair ways towards ruining borderline movies. It is especially a problem for me since I see so movies in the theater I will have seen the big trailers a half dozen times or more (I generally don't ever look at them online) by the time the movie is released.
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