I bet its VERY offensive to politicians
But yeah, I think to get 1984, you have to be a deep thinker....if you're just a bubblegum-popping, flow-going, shallow person, all you'll see is some kind of threat and a bunch of vulgar insults to society. Its a book that should be read, then digested, mulled over, picked apart, compared with reality, then reread to catch all the little nuances you missed the first time through. Its truly ingenious, the way Orwell put it together.
But sure, I think if you take someone who believes deeply in the "system", they'll probably take offense. It also takes a certain amount of internal rebellion against society to truly accept the book. I forget his name, but there is one character who
Spoiler: believes whole-heartedly in Big Brother, who is eventually taken in by the thought police because his son hears him talking badly about the government in his sleep.
Basically, I think this character represents the kind of close-minded people who are unable to comprehend 1984.