The thing about Flickr which is currently much better than Photorddar is the quality at which images can be viewed and previewed and their gallery structure generally. PR's picture quality has improved with the last update but is still poor - and as for those tiny blurry previews!
Until these problems are resolved there's not much chance of having a vibrant gallery community.
I sometimes start to look at the user gallery page but the previews are so poor it's hard to work out which ones are worth opening, and then there's the much-documented problem with not being able to see recently updated galleries so individual posters can flood the pages...
For the meantime at least I will do my browsing and commenting elsewhere.