Channel view is horrendous. Where do I start? The old layout wasn't perfect, but everything was laid out very simply on one screen, with a very clean design. I mostly like being able to scroll through uploads on the right while watching whatever video I click in the center. Now I have to leave the user's channel to watch a video, come back, find it in the many pages of slow-loading, badly spaced upload space. Everything seemed integrated before, but now it is all scattered and ugly. Yes, the buttons are shiny, but that does not make them pretty. And removing the ability for me to middle-click to open a new tab on more and more objects is getting on my nerves.
Revert to the old style, give the ability to comment on a video without leaving the channel (You know, like we used to. You actually added a GOOD feature and then took it away! Aaaaugh, YouTube!), and everything will be gold. Then just STOP TOUCHING THINGS.
Also, ability to customize homepage. I hated the LAST homepage. This one is even WORSE!