People don't get them due to efficacy. People know the makers plan in advance and try to predict the strain that will hit and their prognostication is understandably sub-par.
The pros still vastly outweigh the cons. I hadn't been getting one largely out of laziness and slight needle phobia in previous years. I changed only once it became a requirement for visiting aged care homes, and even though they don't enforce it, have continued getting my annual jabs. Flu vaccines do actually generally provide quite good protection against infection of the most common strains.
