Do you think that mass marketing is important to market new product and service and why?

Marketing always have a cost impact on the products and services, so remember always, that the word MASS, always has a limitations on the size of company and its financial strengths.

I would like to say effective and affective marketing is more important rather to focus on mass or small.

Yes.

Mass marketing allows you to reach out to large number of people at the same time within a period of time. Mass marketing takes away the burden of you having to sell to each customer differently and helps you sell to lots of customers at once.