You should read the articles about this again. There was no meta study showing this. There was a meta study questioning efficacy rates, but only in certain groups. There was also an article about research done on ferrets that I think you're referring to about increased likelihood of flu which applied to only ONE year, 2009. The researcher's theory
That theory relates to the fact that the 2008 vaccine protected against an H1N1 virus that was related to but not similar enough to the pandemic virus to generate antibodies that would neutralize it. The thinking is that might actually have facilitated infection with the pandemic virus.Note that the researcher also said
But in the meantime, Skowronski insisted the findings should not deter people from getting seasonal flu shots. "I do think it's important to clarify that our findings are unique to the pandemic," she insisted. "Pandemics are infrequent occurrences, but seasonal influenza recurs on an annual basis. It's a substantial cause of morbidity and mortality," science's term for illness and death "and the seasonal vaccine substantially protects against that severe outcome due to seasonal influenza."