From every site I have visited or community I am part of, I can easily say nearly half is upset about one thing or another, Yes someone should have a job review with those stats IMO
Not really. It's the internet; someone will ALWAYS be upset. Lots of someones.
Just because someone is upset does not mean someone should get fired or reviewed or demoted, because you can't please everyone. Ever. Too many different personalities and worldviews and personal opinions to ever please anyone.