Maybe it's a function of how many people are using it so far but the WiFi entertainment option on United works great. With AmazonFire tablets available for $50 it seems pretty silly at this point for airlines to install extremely expensive screens that also take up leg space in many cases.

It may be a pain for the family that travels once a year but, hey, they didn't actually have movie options until recently anyway. I'm sure they can deal with it.