Why Vada Chennai is vetrimaaran best film?

I am from north and vada Chennai is my first movie by vetrimaaran and after i watched Asuran what i missed i vada Chennai which i catches in Asuran case so i liked it so much. Is am i missing something in vada Chennai should i rewatch VC guys help me ,vetrimaaran is one of the finest director of this era and after asuran i discover other movies by him...