- Inbox
- Collections
- Video Responses
- Subscriber Feed front and center, not 3 clicks away
- 5 star rating system, not just Like/dislike
- Comment system that didn't require Google+ and wasn't tied to some terrible algorithm that sorts your comments out based on how popular the person commenting is
- Comment dislikes actually doing something (they used to mark messages as spam automatically if they got enough dislikes, now they just get 'pushed down' by the afore-mentioned terrible sorting algorithm)
- Modifiable profiles to make your channel more unique, someone mentioned the background image but there was a lot of other stuff you could do (though I understand why they got rid of this)
- The same random videos being promoted to everyone on the front page instead of the terrible 'Suggested' algorithm
Oh, and speaking of the 'Suggested' algorithm, the 'Up Next' feature up until VERY RECENTLY (like 2 weeks ago) used to put videos from the same channel, and especially videos that were next in a playlist. This was GREAT for channel retention and growth for creators, now it seems to follow the same algorithm as 'Suggested' which is to say, 'Up Next' links to random unrelated garbage that you never wanted to watch ever.
So basically, every feature Youtube has removed or screwed up over the years lol...