Really, this has been an issue since 2008, it should be as easy as bringing up a member's content in the new Moderation Section in the Dashboard via a search function, or giving admins/roleadmins a check box next to each image with a handy delete function. Or when you delete an album, the images in that album should go too, there's a reason the album is getting deleted.
I just had a member post hundreds of scans of a comic book on my network. 2hours in and I'm no where near close to deleting something that should have taken a few seconds to do. :/