Yeah the old buttons looked like buttons, it was obvious they could be clicked. These ones look more like an outlined header or something. The disabled ones don't really look disabled if they are not next to a non disabled button either. Aesthetically I think the current version is much better. Personally not a huge fan of everything going to this 'flat' / metro look but it seems to have really caught on.

Yea the new buttons just don't feel right. In the case of checkbox (button toolbar style) it is quite hard to tell which one is selected. Maybe they should aim for a more Rdio/Dropbox style solution. Mostly flat except for buttons and input elements.

They actually don't look like buttons at all, which defeat the purpose of a button.