I've seen some bad tutorials and videos, but in my opinion, the one linked in the original post is not one of them.
Her technique was good. I don't pin strips either -- pinning does not add to accuracy necessarily. Her pressing technique might not be exactly how I do it, but the video was not a pressing demo -- it was showing how to use 2.5 inch strips to make an interesting design. I do think that she could have given a little more time to explaining how she aligned her ruler for the cuts, but since I've done a fair number of quilts, I could see what she was doing, and I'd be able to make the quilt.
To my mind, these videos are not really intended to be an exhaustive training manual for absolute beginners -- they're inspiration and idea generating, and they're selling a product -- the jelly rolls that are so prevalent now. They do a good job of that.