First off, videos from channels i am subscribed to do not show up in the subscriptions tab, although this happens occasionally it still needs addressed...
Secondly, the home tab is completely useless now. Every video block is fully sized and not categorized based on recommendations, channels, or newly uploaded.
Third, the trending tab needs to be customizable to what Im interested in, rather than what everyone else is watching...
Just redo the app already... It needs a better UI.
Sventre665 about YouTube - Watch, Upload and Share Videos