I've got some site with pages that I consider to be pretty crappy, but they get the job done. The audience converts. I have told the client to upgrade the pages to "future proof" the site against loss of traffic. If the competition starts offering better content, or if the search engines raise their standards, these pages could be toast.
If only clients would follow advice when they're given it! SEO is like weight loss, people will substitute actually going to the gym with buying ebooks about going to the gym, instead of dieting they'll buy books about dieting and make diet recommendaton lists, instead of actually doing SEO they'll substitute it with hiring an SEO and then ignoring 90% of the advice that's given.
BB (308lbs on the hoof, baby!)