The Like And Dislike Buttons Let's Say You Have A Video Go in To My Account tab and Turn Stars In To Like And Dislike
Now that Video Click the Dislike Button To Say I Hate This Video
The End

Switching between aspect ratios My suggestion would be to implement the feature of being able to switch the aspect ratio of the player from 16:9 to 4:3 and vice-versa. I think it would be a neat little addition, especially since it's also possible to choose between channel designs and, if I recall correctly, layouts, coming in the future.

Channel banners It would be pretty cool if channel banners were added for better customization

channel design from 2006 add that channel design because there are already designs from 2007 - 2012

And so Πρόδρομος said: I guess that this place simply needs more traffic, a mobile app would change that since most ppl are on their phone most of the time instead of computers.
Also a better layout for ads would be preferred.