In flight entertainment and the actual seats in Economy and Business are roughly equivalent to BA or Virgin about 10 years ago. Their 777s have seat back video (some of their 747s don't!), but the quality of the films on offer is low. Economy class food is absolutely terrible.
So, Economy Plus (standard economy seats but with a longer pitch) is the only reason I continue to use United. I'm very tall, and my company's Economy-only travel policy means this is the most comfortable transatlantic option for me.
If I fitted in a standard Economy seat, I would fly with someone else.