It's always sad to see this cast as a left/right thing - or "Wikipedia has a liberal bias". We equally have huge problems with right wing agenda's on some articles. And most of the BLP issues aren't related to politics, but to all manner of "sides" (sexuality,political,ethnic,historical and those are the non-trivial examples).
Biographies are a mess; we have detailed criticism of fairly non-notable people who've done nothing except piss off the wrong person once or twice. And we have others who are so beloved of their followers that trying to write any fair criticism is like pounding a brick wall.
With a lemon.
Tom
Our problems come more from the left than the right, but that is partly due to the extremely low quality of editing from the right.
Fred