Buyer beware. It's not $8/month to watch any movie ever made. It's just access to a relatively limited streaming library. It's in all of the conditions when you sign up, and is relatively common knowledge. The DVD inventory is orders of magnitude larger than what they make available via streaming. That said, the streaming of TV shows has been a godsend for the little monsters, allowing them to watch any of literally thousands of episodes of all the silly kid stuff that they might be interested in (power rangers, ninja turtles, and a bunch of lesser known series).
Sites like these help make the current streaming inventory transparent:
http://netflixusacompletelist.blogspot.com/
http://www.canistream.it/
http://instantwatcher.com/