my theory:
Its because we have a ton of movies that dropped and (almost) every single one is good in its own way.
However, we all know everyone has a different taste and different expectations, it's only logical that there are going to be certain disappointments and we all know that it's easier to express hate than love for something....
so, in short =>
many different movies + many different preferences/expectations = many disappointments
=> many hate/cry threads .......