aptitude test is one of the way to judge how the person behaving in certain circumstances and to see where this person fit.

A successful or failure of an aptitude test is first determine by the test itself. The main question will be are the employers using a set of proven aptitude questionaires or there just developed themselves ?

Now, aptitude test has to do with psychology, thus for those of you who had sat in the test b4, you will find a lot of 'wierd' questions, repeating questions, and sometimes questions with answers that are very close. A proper aptitude test must be developed by someone qualified, not just any tom-d***-harry

So, whether it is a good measurement for a company?...it's depends...