It depends on your life style and where you are from. If you are from the MENA, ISC or SEA , it is a pretty decent salary to live on.

People live on a quarter of what you are offered with families in Doha. Search in QL and you will get an idea of Costs based on your lifestyle.

All depends on how you want to live your life.
Accepting the offer is based on your qualifications, experience and current pay and your perception of future growth in the current organization.

Think over and decide.