I don’t have a problem with Wikipedia, I have a problem with it taking over Google Results.
Wikipedia has a tendency to add nofollow tags on all legit outbound links, in essance hording Google’s PageRank.. (People link to Wikipedia, Wikipedia doesn’t link out).
Wikipedia could be considered a parasite when it references articles as a source for it’s content, but delivers a nofollow link to that source.
The solution would be to provide a tab that delivers Wikipedia only results, and remove Wikipedia from the general SERPS. That way the general public if they are looking for a Wikipedia Definition of the search query, they could get it. Because 99% of the time, we are not looking for a Wikipeida article, even though that article ranks for every single related term.