I don't think the failure rate of the initial type course is as high as 50% but its not an easy course. If you are prepared to put the work in then you'll get through. Regardless of how many hours you have, if you have a bad day in the sim or on a check flight then you're not likely to get through it. But few and far between I'd say. There are the one or two per course that struggle and get left behind but its not 50%. Its not a case of fail and your out on your ear either (if you show that you are prepared to work hard).
Radar.