Yes. From personal experience and what others report.
http://www.truthwiki.org/wikipedia-2/
I also spoke to a lawyer last year and he told me that lawyers can not use Wikipedia for evidence because it is not based on facts.
https://www.naturalnews.com/046611_Wikipedia_Truth_Wiki_internet_censorship.html
Wikipedia admits fake account and starts cleaning itself
https://www.naturalnews.com/042657_Wikipedia_sock_puppets_disinformation.html
http://www.tadakaluri.org/wikipedia-is-blocking-accounts-that-get-paid-to-edit-pages
Wikipedia blackmails people
https://www.naturalnews.com/052396_Wikipedia_blackmail_engine_Jimmy_Wales.html
Wikipedia is controlled by Big Pharma.
https://www.naturalnews.com/041406_Wikipedia_propaganda_disinformation.html
http://www.rigged.news/2015-11-30-extreme-bias-at-wikipedia-on-homeopathic-medicine-3.html
http://buzz.naturalnews.com/001206-Wikipedia-scientific_censorship-petition.html
Wikipedia is controlled by a small group.
http://www.thedailybell.com/news-analysis/wikipedia-as-elite-propaganda-mill/