The courses actually teach you exactly the same as what apprentices get at college, it's just condensed.
Obviously the practical part is missing which is the huge drawback, but the theory is industry standard.
I mean what other option do us older learners have? It's not like we can go back in time and get an apprenticeship and even if we could what actual adult can afford to live on a fiver an hour? These courses aren't perfect but for diligent folk it's the only route into the industry.
Their efficacity depends mainly on the route you take after the course is finished. I highly believe you should be forced to do at least a year on site with a qualified spark. I say one year and not three because really older folk getting into the industry probably already know how houses work, how they are put together etc. That knocks an awful lot of time off not having to learn how to use tools, how to avoid pipes, how to do the basics etc. I've seen newby apprentices on site a couple of months in who couldn't use a hand saw, didn't know how stud walls were put up etc.
I plan on finding work as a mate. I know i could do the job on my own because domestic electrics is nowhere near as hard as a lot of people make out, but it would be a lot of winging it and making it up as you go along to begin with. It's not the installation that's a problem, any monkey can stick to what regs say in a book if they are studious, to me the difficulty lies in figuring out the current installation and fault finding, alongside 'best practice' stuff like how to go about measuring up and chasing out the best way, or how to run your cables, etc. It's mostly about the process that the experience on site gives you. That and being familiar with older practices, how it used to be done, and materials/fittings/different way of coming to the same finished result. Can't be replicated on a course because they are units not real houses.
Most of the shoddy work seen isn't because someone lacked knowledge it's because they were lazy and tried to cut corners because they had no pride in their work.