I agree with the above post by tjf120, as I recently saw streaming for the very first time, shown to me by a friend, it looked like pure chit, and while I was already wondering why some AHer stream as much as they do, now I really* have to wonder.
For dumb shows, maybe it's good enough. For anything approaching cinematic qualities, what a shame.
Most blurays I own, and most blurays made, are using 50 GB discs. My Godfather collection alone is just a hair short of 200 GB in recorded material.