3 week ppl isn't impossible but is extremely hard work.
When I was an instructor I did several in the UK. In fact one chap did it in two but he did turn up with all the exams done and the RT out of the way.
This schools issues are from the top down. There are issues with some students turning up who just don't have the aplitude or the head on them to learn within the three weeks. But the customer service and attitude to the customer hasn't changed since pprune started.