Actually, I'm an amateur photographer, and Flickr is pretty sweet for me.
First of all, they are doing rating, though it may not be obvious how -- which I think is better than some dumb rating widget that can be abused -- and if Facebook would be able to show you pictures by rating, all you'd ever see are pictures of teenage girls in tight miniskirts, which get dozens of times better ratings then the pictures uploaded by my artistic-friends ;)
Here's what Flickr does: http://www.flickr.com/explore/interesting/
Then, there is no cheaper alternative for keeping a backup in the cloud. A Pro account is $2 per month, with unlimited uploads. I know people that have over 50000 pictures uploaded using the original size (that's over 150 GB of data btw). And I actually wanted to upload my photos to S3 or to Google's Blogstore or to Dropbox, but it's gets much more expensive for such a volume (and currently I'm uploading 2 GB / month -- my baby boy is growing up :)).
Also, on Flickr you can access the EXIF headers of a picture -- and if you type your camera's model in their search box, you get thousands of photos for which you can access details like exposure, aperture and focal length, thus you can get better by examining the work of other people.
Also, it does feature a "share on facebook" button, with which you can publish a link + a thumbnail on Facebook.
Yes it sucks, but it is better than any alternative I ever tried. Pretty tired of hearing "if Facebook does this or that" too -- I'll be happy if they do, but they haven't and they aren't interested in art -- they are more interested in tight miniskirts of teenagers that get massive upvotes ;)