It is a fact that those least able to give an objective assessment of a FTO are the students currently undergoing a course - unless they have previous experience of other FTOs operating in the same market. Inevitably, students' opinions of their FTO are subjective and largely based on the FTO's own marketing hype.
As for the CAA publishing figures of who got what jobs from which school, I'm afraid that's pretty much imposssible. Most jobs are obtained by people long after they've left their FTO, at a distance where the particular FTO is no longer relevant to the issue. To relate the jobs to the FTOs would be at best misleading. As we know from students' experience at Oxford, the temptation for the schools to claim credit for students' own job-searching efforts is already sometimes too strong to resist; 'official' statistics of the kind you're asking for, however misleading, would make that deception easier...
As in all things, buyer beware!
Scroggs