My local newspaper pointed me to ratemyteachers.com a website that allows students Australia-wide to anonymously rate their teachers by applying 5-point scales to the 'easiness', 'helpfulness' and 'clarity' of their teaching efforts. Comments can also be appended to the numerical evaluation. University teachers are evaluated as part of the survey.
Predictably the dinosaurs in The Australian Education Union, such as Mary Bluett, object to any such evaluations because they might be negative - some teachers have rung her saying they are 'hurt by the comments'. But the comments might also give undue praise - glancing through some of the schools that I know about I saw a few exaggerated comments in that direction.
The comments too are entirely unrepresentative - the 'squeaky wheels' are most likely to offer a view and indeed perhaps to repeat views by 'sock puppeting'.
But still I have some sympathy for this flawed evaluation technique. I know from experience that incompetent teachers do maintain teaching positions for long periods in both schools and universities despite various internal, private evaluation procedures.
Reforms that retrain or replace incompetent teachers are overdue and would do away entirely with parents needing to rely on biased public websites to get information.