The comic referenced at the top of the article was good for a laugh or two: http://theoatmeal.com/comics/design_hell
Citing the second part of the comic - Client: "Our last designer was an IDIOT". Then the next appropriate question is - What idiot hired/managed him?
You're about to become the 'last designer'
This is critical, and it's fairly easy to recognize potential 'problem clients' when there's still time to escape.
The comic said: "The client has completely forgotten that they hired you, the web designer, to build them a great product."
Whereas I see: "You have forgotten that the client is paying you to build a site which best represents the business in which they are the domain expert."