I am of the mind that any training is better than no training at all. I believe that an individual who sit's down and do some research will come up with training that will make him a better shooter, and better prepared to handle a life and death situation.
If a group did the same thing the results would be the same, but better. As people who have taken the initiative to purchase a firearm as a commitment to self preservation. I'm sure that same person is capable of reading some material, and talking to others... then coming up with a training scenario relivent to their needs. Excluding nut jobs... most people can fend for themselves. Again I'm not suggesting that anyone imagine they could come up with anything near what a professional dedicated trainer would produce... ANY TRAINING IS BETTER THAN NONE AT ALL.