I point out the difference in training between nurse midwives and lay midwives often, and there is a difference in that nurse midwives have more training and more accountability. I would say that on average there is a big difference in practices and attitude as well, but of course there are horror stories about CNMs just like any other profession. The common thread seems to be Natural Child Birth (NCB) advocacy.
Here is one such story from the UK, where there have been many problems because of midwives pushing vaginal birth no matter what, and otherwise discouraging any intervention during births. The father who lost his son to negligence is treated like an inconvenience, as an unimportant voice, in the natural birth debate. We should be listening to those who paid the price for ideology based decisions. That is the only way to learn from the past.