Are psychometric tests just a game?

YOU know the form. Sometime between sending off your CV and being offered a job, you're asked to take a psychometric test. “Just a few basic aptitude tests to measure your verbal and numerical reasoning,” says the HR person with the perma-smile.  

“Nothing too difficult. Then there's a personality questionnaire. Don't worry about this one at all either. There's no rights or wrongs here. OK?”