I have met many very kind natured staffies, who have been excellent family dogs
I have also had a very bad personal experience with a staffie X that I got from a rescue centre, some years ago! She seemed the most sweet natured dog in the kennels, however when we got her home, it was a different story, she was very aggresive toward us humans
One night when I was alone she cornered me on the stairs, she wouldn't let me move, was acting very aggresively toward me, I was trapped on them stairs for hours, scared witless
You would think that a bad experience like this would make me think that ALL staffie "types" are like this, but I don't think like that, yes if I am honest I am more warey of them, but I wouldn't judge the whole breed by this one experience that happened to me.
Like with all things in life, you will always come across the bad apples unfortunately, human nature sometimes only remembers the bad ones and forgets that on the whole the breed is like any other! We have all heard stories about cockers being aggresive and i'm sure we have all been upset when strangers have commented about our beautiful breed having rage, its upsetting when people judge a whole breed, by a handfull of bad experiences.
JMO