There are a few movies I actually didn't go see due to the trailer ruining the plot. I remember a movie with Gene Hackman in it...about some court case that turned into a chase-thriller...but the trailer ended up showing ALL the major plot points and their secrets...so I passed.
Now the Island is out..I was going to see it until I saw the trailer...now I know the big secret and so what's the point of seeing it?
My question to you is...do trailers that spoil the major plot points discourage you from seeing the film?