As someone who has never taken a course, an 'outsider' if you will - I have to say that some of the best Buddhists I know are students of the Goenka system. I have some reservations about the way sankhara is interpreted and seen as something to 'burn off', but at the end of the day if I am to lay a side my personal views and survey the results: The amount of praise he gets from students who have taken courses is very voluminous indeed.
If you haven't seen it, there's a video floating around the youtubes about Indian prisoners who we're all given the option of taking a Goenka course - It was massive, hundreds or even thousands took the course. Many of them we're interviewed at the end and later on to see what they thought, and the changes in their outlook and behaviour were amazing.
From what I can see, the Goenka method seems to churn out compassion, equanimity, friendliness and an overall sense of peace in those who practice it well (exceptions granted) and I think that speaks for itself.
"For a disciple who has conviction in the Teacher's message & lives to penetrate it, what accords with the Dhamma is this:
'The Blessed One is the Teacher, I am a disciple. He is the one who knows, not I." -