Speaking from experience, Deviantart used to be one of the best sites to post your own art. However, a combination of lack of communication between developers and users, too many people on, and the copyright issues a few years back caused the site to become the poor shadow it used to be. This may be just a phase in it's development. As for whether or not Deviantart is really and truly 'broken', well, only time can tell.
I still have my account on Deviantart because I want to update my comics there. You can still become popular there, but it'll take A LOT of work by continuously updating your account, posting your work on the groups that they have on Deviantart, and communicating with the other artists.