Reason why kolkata should not be considered boring:

Cultural hub : the kolkata being the old city of india has several culture with in it and host numerous festivals like durga pujas and many more which flourishes the city.
Historical significance:the city has many buildings from the british era itself such as victoria memorial ,howrah bridge and many monuments from that era.
Educational aspects: the city is well reputed due to its Educational hipe the university of Calcutta proves the caliber of an individual and the jadavpur university itself is giant in education arena.
Diverse cuisine :kolkata is full of diversified food their traditional bengali dishes and their street food marks a amazing craze among everyone.

Reason why some might feel kolkata boring:

Traffic levels: the traffic in kolkata is lot which for many makes it uncomforable to live .the people may suffer due to it .
Climate change:the hot and humid climate of kolkata makes it hot pan for every individual and thus makes it quite unimaginable to live there.
Urban challenges: like the other metropolitan cities the kolkata has same issue about pollution ,coagulation and population thus it makes uncomfortable to live in such aa crowdy and polluted area .
Pace of life:the person might not feel such pace of life by living so in the other indian cities like banglore and mumbai ,their pace of life is not so comparable with the kolkata .

And all these aspects can make someone feel like boring….