In the process of being interviewed for a job in a company, is it fine to give the negative points of your previous company?

No it's not fine to talk negatively about your previous employer, keep it positive as much as you can. In the end, recruiter are not looking for a negative attitude person to hire. 

Over dosing is always a negative point. Try not to speak too bad about your employer.

not exactly, its better to say what is reality whether positive or negative