It would be interesting to know which subjects they failed as there is some particular poor teaching at OAT. Be warned...
Why assume that these individuals failed due to poor teaching? If you decide to undertake such a course, you should be prepared to put in all the work necessary to achive the highest passes possible and shouldn't be relying purely on being spoon fed. If a large proportion of the class failed a particular subject, then yes, you may have a point, however this was not the case.