I work with hundreds of regular people whose WP websites I build and maintain, and I have seen only two major problems with the Editor, over and over. I have to explain these two things to every single client. Nothing else is a problem.

1. The second row of buttons being hidden until someone finds out, somehow, that a button oddly named "Kitchen Sink" reveals the other half of the editing buttons. Can anyone honestly claim that this isn't completely ridiculous? Or can anyone give me even one reason why it's like this?

2. The "Visual" and "Text" tabs -- forgetting how they work for now, just their existence. If I didn't explain this to every single regular ("not particularly technical") user, not a single person would ever have the slightest idea that they're there, much less what in the world they are. ("Text"? In other words, the opposite of what it actually is?)

All the rest of the changes mentioned above are so minor and unimportant in comparison with these two things, which literally trip up every single (ordinary) user.

Just saying. :-)