Depends on your interests. IMDb is great for movie lovers. Tunein Radio doesn't sound exciting, but I find it fascinating, instant access to thousand of stations around the world. BBC iPlayer..of course. Netflix..but some people have had problems with a recent update.
That's one thing I've found, an app can start-off great, but later updates often ruin it. Why I don't know, if something is working fine, leave it alone.