I've adminstered flu vaccines to patients for many years. I too have it now. Sometimes I get an achy arm for a day, but never anything else. As others have said, its a dead virus, not live, so its not 'giving you a bit of flu'!!!
The year that the H1N1 swine flu was added to the regular flu vaccine, I had many more people complain of symptoms. I assume this is because that viral strain was different to the regular type circulating that people were used to. Anyone that has had proper flu, as opposed to a 'bad cold,' would have the flu vaccine. A day of a sore arm is worth days in bed with a fever and unable to move!!!
Those that say they have symtoms from the vaccine should note that its often given in Autuum/winter when colds and flu are starting up anyways, and many people attribute the vaccine to giving them all sorts of unrelated illnesses. Its DEAD, it cant give you the flu!!!
Another common idea is that once you have it, you MUST have it annually or it weakens your immune system. This again is rubbish. Its advised to have it annually as virues change and mutate, so the vaccine contains different strains each year. It certainly doesnt make your immune system weaker though if you dont have another one. In fact, you'd still have some immunity from even 1 flu vaccine, but it it recommended to have it annually- but certainly not detrimental if you dont.