I guess I’m part of the great unwashed masses, because I enjoyed Bright quite a bit. Perhaps because I didn’t view it as a standalone movie, but the introduction of a fantasy series.
Not sure what critics where expecting. The race and inequality allegories are not subtle, but they touch on a lot of issues. You could read too much into the privileged class of elves. Do they represent Jews? More likely they are intended to represent white privilege and/or the one-percent’ers. Do some races have innate advantages (brightness) that drive inequality? This is a harder question to answer. Very few humans or orcs have the Bright (magic) ability in the movie. In some ways the movie is very predictable, as a plus or minus it raises uncomfortable social questions (without resolution). Perhaps some of its low score is because it fails to give the perhaps mandatory expected PC answers that Hollywood’s seems to demand.
I found the obvious racial stereotypes the second Star Wars trilogy harder to overlook because they weren’t trying to make any comment about racial inequality, but just playing to stereotypes out of laziness and/or carelessness (hopefully not malice).
In general I find I usually agree with the critics scores more so than the audience scores, so this one surprised me. I suspect this is a movie that for whatever reason is liked or hated by many with little in between. Since critics have to watch all movies it gets a low score. People inclined to like fantasy and action movies self select in going to and giving a rating to this movie. Largely I think if you raise social issues, critics expect some kind suggested social change, whether realized by the protagonists or not.