How did nitrous get such a bad rep...?

Roots supercharger, ProCharger, and turbos are all accepted as just fine...
But let's say you're going to use the power outer nitrous and many balk at it...?..
I understand this is mostly from people who've never tried it...
Is it that they watch TV and movies and see it done on cars as if it's some kind of super easy thing to do?..
I fail to see how it can't help any car..
My biggest question is there anybody out there who has used it and has a negative opinion of it or is it just the people who haven't...