I wish I could convince the team to remove the Joel Test score from job listings. I certainly do not support making it a search filter. Why? Not all of the items in the test are particularly applicable to all forms of development (especially web development) and some tests are more important than others for different developer styles.
The truth is, trusting an arbitrary score that isn't tailored to your specific needs is not going to help you find the right job for you. An 11 might as well be a 0 if you absolutely require quiet working conditions to work effectively. A 3 might be just fine if you want to be the second developer and 3rd employee of a start up.
Don't use the Joel score as a filter in your job search. Use it as a collection of questions to help you think about whether a job would be a good fit for you and ask the most important questions for you in the interview if the work you'll be doing sounds interesting.