I've never gotten it, and also never had the flu (besides a stomach flu, three times, but I don't think that counts). Although I wouldn't say my immune system is great (I get colds ALL the time), if I were to get the flu I am 99.9% certain it would stay the flu and not turn into something like pneumonia. So, I don't get it.
My dad works at a hospital and he is required to get it. I think the past year or two he's gotten it, he's gotten ill from the vaccine. No thanks.