Why does Vijay do average movies?

I heard that he rejected a lot of good directors for his last film like vetrimaaran, Karthik subbaraj, pa ranjith etc. post mersal he has been doing average/shit movies with the nearer exception of master which was nearly perfect if most parts the 2nd half didn't feel rushed or out of place. But yh his movies are getting more boring with no good storylines with a lot of cliche scenes being pulled. But yh If he fails politics I hope he changes his sense of script selection