I agree with what Obannonsleap said! it all depends on ur intention of the article marketing campaign. If its traffic then mass submissions do great , imagine placing your link on 2000 directories and since they are permanent you can expect a traffic of 10k even if 5 people click on each link (which is really less) . If you are doing it for backlinks or otherwise just spin the content and this will make sure you get benefit from all of them . I have myself trued and been successful in gaining traffic from articles for all my site . Recently launched a new SEO site and within 10 days its an alexa 250 k already with just 30 articles posted. Article marketing works and leme tell u one thing there is no such thing as a google sandbox or ban ! If you can prove other wise i will give u my sites password and take penance !
dont trust the SEO fools out there , these are just teenage kids whos grandma told them old SEO stories on facebook ! sandbox was eliminated in 2005 and as of now i will answer your question very clearly NO INCOMING BACKLINK CAN EVER HARM YOU no exceptions! not even spammy sites! you would only get a penalty if you link out to spammy sites or installed malwares or use doorway pages and cloaking . go for article marketing , its backlinks in the purest form !