Some people think they are still effective. Some think they are secondary, and at the very least it can't hurt to repost copies of articles already on your site, with the hope others will syndicate them.
Others of us have thought for a long time that this type of article marketing is not effective anymore, and is not worth the effort. This comment by Matt Cutts at Google (Jan 29, 2014) seems to confirm that thought.
What is your recent (2013-2014) experience?