- Poor quality of work (or, rather, the good photography is buried under mounds of dross). 500px has the advantage of being new, and limits monthly uploads, so the quality there is surprisingly high
- Vacuous comments. "Nice capture!". "Great shot!". This is only made worse when looking at the horror-movie-esque overdone-HDR monstrosity.
- Group and all flashing badge icons in comments
- woeful mobile interface which is slow and eventually displays a non-zoomable postage stamp sized image. I cringe whenever I see a Flickr link on twitter
In short, Flickr might still be a place for photographs but not for photographers. Actually, I think photoblogs or 500px combined with twitter provide a great way of showing off your photos and getting great feedback from people you respect.