Hiring a web designer does not mean that your web designer is a yes-man. There is a need for him to know your business and your website design will be best designed only when a person knows about the design. Their know-how will ensure a best design as the end result.
A web designer nodding heads and producing the replica of that you say may be good, but you cannot get the actual worth for your money. Your designer must also gives you exciting ideas. When the designer comes with ideas, you can see the result as desired and the best.