Xfce 4.6 has been out only since yesterday but there are already a great number of reviews spawning all around the Web. I'll try to keep a list of the main ones here:

French:

Spanish:

Czech:

As usual, Béranger found something to complain about :) But as he is complaining about the transparency of desktop icons, I think we can still say that 4.6 is a good release!

Reading those reviews, I can see two main issues: the desktop right click menu and the menu editor. For the menu editor, our rocking Jannis Pohlmann is already on it and is making really good progress on libxfce4menu: it'll allow us to use Alacarte to edit menus in Xfce 4.8 or to develop our own menu editor, if someone volunteers for this. For the right click menu, just find a beautiful wallpaper and remove all those ugly non-transparent desktop icons that hide it and your old beloved menu will be back!

If you find any other interesting reviews, please share them!

Edit: I added some links from the comments.