Picasa for Linux 3.0, was very good [nothing is perfect]
features I like
1) the ability to scroll through the file tree, without opening & closing folders
2) an editor that crops, resizes, minor color adjustment...
3) uploader to G+ webalbum
I'm on Digikam [KDE ], which is overkill, but the uploader is perfect, not so much as a hiccup even for, 100's of pics at a time.