sat test good or bad?

I believe that the sat test is a bad representation of what kind of a student you are. most people I know can not concentrate for six hours on a test. Some kids are just bad test takers and the test fails to show talents beyond that of time management accurately. why is a student who can finish all the questions in twenty five minutes any better than someone who can't. The worst part is no one will ever know if given more time the other student might get more answers correct and receive a better score. Just because I am a slow reader or slow with math problems dose not mean I am bad at math and can't understand a story. I get that time is money but what's more important speed or accuracy? what do you think?