As far back as 20 years, professors/teachers were adamant against citing Wikipedia for good reason. I thought it was a neat idea when first concieved, but once those with agendas got involved, it became trash. As an aside, you may have been here long enough to remember the handle 'Eschoir'. He was one playing games with Wikipedia regarding the Free Republic entry.
A reputable reference like the Brittanica would never do that. If a subject had controversial opinons, they would state those opinions matter-of-fact and let the reader decide for themselves. Then again, they have scholars writing their articles, not people with a political agenda or axe to grind.
I do remember 'Eschoir' from the old days, not aware he would maliciousy edit Free Republic's Wikipedia entry - but not surprised at that either.