What is the most empowered person to assess the company recruitment after selection of candidates? How is the assessment?

He who has the most expertise in the field and the most informative

 CEO can assess the company recruitment by:

1.   Efficient staff

2. Labor turnover

3. the organizational goals & objectives that achieved

I agree with colleagues answers

each department should conduct a one on one meeting or interview (informal) after considering each candidate and considering all options, the department head should make the decision based solely on a point score that can be calculated through points of education, experience and professionalism.