None of us have ever had a flu shot. About 6-7 years ago, dh and the kids all got it, but I didn't. They were sick for several days but not terribly sick. Dh took Tamiflu for a couple of days, but he said it made him feel very weird. So he quit taking it, and we didn't give it to the kids. None of us get sick very often with any virus, so I think we have decent immune systems.
My sister had a lady in her Sunday School class get the flu shot and then develop the Guillan-Barre syndrome. She was paralyzed for 6 weeks, and she ended having an amputation. She was convinced it was because of the shot.