For my tuppence worth, it's actually two fold. There isn't inherently anything wrong with the courses offered by OAA, CTC etc. "All" they are, are another FTO offering a slightly differently structured route to CPL/ME/IR.
One thing that bothers me very greatly is the number of threads where people coming out of flight training are generalised as being rubbish pilots. I don't think this is true - they are inexperienced. Inexperience is a label that even the most grizzled, experienced, veteran captains have also had to wear at some point....experience is ONLY gained through "doing it". It's the one thing in this industry that you can't actually buy.
So what's the answer? To my mind, one of the simplest methods (talking in an ideal world) would be to force regulation such that the route to airline RHS was defined. The major problem is that flight training now costs SO much money, regardless of which route one takes, that the RHS of a jet [theoretically anyway!] offers the best return on ones investment. This is what is driving newbies to seek the Jet jobs and in turn drives down conditions. Because there is a horde trying for the RHS and there is no regulation stopping a 200 hour newbie (this includes me, btw) going straight to the RHS, it allows - shall we be kind and term them - "enterprising" ventures, both FTOs and airlines, to generate revenue from them.
The biggest issue of all that continues to drive this ethos of self sponsoring is that all of us - every single one of us - newly qualified pilots know that if we DON'T take an opportunity that arises, then someone else will.
The debate over self sponsored type ratings has been going on for years and indeed things have only got worse...with self funding of line training becoming more and more normal - to the point, I'd suggest where "merely" paying for a TR with a guaranteed job at the end looks a positive bargain.
Therefore the experienced can say until they're blue in the face that "if only all the newbies would stop paying it would all go away" -which is true - but the sad truth is that will never happen. However, DEFINE the route to the RHS, rather than leaving it open to interpretation or financial capability and you remove the dog eat dogness of it and in turn things would calm down.