Yes. I think article marketing is more or less dead. In 2005 I wrote a good article that I researched and spent about a day writing and posted it on ezinearticles. Within two years it was picked up by at least 30 sites all with the proper incoming links (that was before the scumbags knew about nofollow). The search term i was trying to promote, which was the 3 word term for an immensely lucrative 2 word term. Went up to number 3 in google results and as a result, I made a ton of $$.
Fast forward to 2009. I was working on SEO one week and found that another article I had written about a year before and put on ezinearticles had been picked up by around 20 sites and propelled that search term into the top 10. Again, highly profitable. So I decided to really do article marketing and not just write one or two articles/year. My plan was to write 10 really good articles figuring that over the course of a year, each would get picked up 20-30 times if I wrote best of the category level articles with unique and useful information. So I did it, and on top of that I started to post to about 5 different article syndication sites.
The results? One article got picked up about 40 times in 6 months and I only got about 7 valid backlinks. All the others either chopped it up and just used a couple of paragraphs, gave no links, or nofollowed the links. One guy even posted it under his name in the same article syndication website, with his links on it. By the time I found him, his account had been recently deleted.
My take on it is that ezinearticles does a really good job of screening the articles that are submitted (they scan the web to make sure it is not a copy of something else) and for some reason the people that acquire the articles from their are *much* more likely to give you credit. Other sites are just hotbeds of scammers, the worst probably being articlesbase
So I started sending cease & desists with a cc: to firstname.lastname@example.org to everybody. It takes about ten minutes to do whois modify your form letter and send it to the owner and the host provider.
About 1/5 of the time the whole blog or article website account gets deleted. That probably means they are a multiple offender. So if everybody here sends out cease and desist letters, word will get around that if you steal articles and get caught, you could lose all the work you've been doing for months or years!