The dangers of an all powerful state are pretty obvious and treated well in Orwell's 1984 and numerous other texts. The state in Brave New World is quite different. The danger is, of course, total control of the population. People are created "as needed" to fit jobs that they will fulfill later in life. Their education, through hypnopedia and other techniques, makes them accept their position in life as the best, no matter how menial it may seem to us. Most of the "passions" of our life are dealth with by making what satisfies them readily available. Sex is no longer seen as something to be shared with a person, but with anyone you wish since everyone belongs to everyone else. Want new thing? That's also the best; after all, ending is better than mending. And, of course, if things don't go well, there's always soma, the cure for anxiety, rejection, frrustration ....
To get this "paradise" you give up everything that we would recognize as individuality. There have been some lively discussions about whether this is a good thing or a bad thing. Would it be such a bad thing to be happy all the time? Is the problem with drugs in our world that they don't work well enough? John, of course, is the argument against the price of this paradise. But do things work out all that well for John? Is the price of individuality worth it?
Of course, even their society doesn't work for everyone, and it's clear that Huxley would not recomment it for all of us :)
the dangers would be very baad because you are not in charge of your own life but the thing would be that people would not be aware, being on soma. If we werent though we would be in some trouble