The problem with flu vaccination is flu is not a single disease causing agent. There is 150 potential H?N? combinations, And the myriad sub variants. Each year the vaccine manufacturers pick half a dozen or so.

I had it once because I was going to Bucharest and some people had died.

After I got it the nurse told me it wouldn't help because it was a different strain. 

I had fever And aches 2 days and it didn't achieve what I wanted it to.

I wouldn't discourage anyone from having it but my strategy is to make sure my immune system is working which gives broad immunity.