I must admit many GTK3 applications are looking a bit odd for me at the moment when using other non-Gnome DEs.
I prefer to use the tree view in the shortcuts pane so it doesn't waste space. I use pathbar style, so the reload button thing doesn't concern me, though I can see why it might annoy some people.
As for gtk3 theming, I prefer dark themes (white text on black), and the closest thing I've found is a theme called xfce-dusk-gtk3, but it hasn't been updated in a year. gtk3 theming standards have changed a bit since then, so I get some visual anomalies and a bunch of warnings in the terminal.
The XFCE Fedora maintainer created a personal repository (using the Fedora infrastructure) w/ fully updated XFCE 4.10 for both Fedora 16 and Fedora 17.
http://repos.fedorapeople.org/repos/kevin/xfce-4.10/
Simply drop the fedora-xfce.repo file in /etc/yum.repo.d and you're done.
- Gilboa