Plenty of answers here on why they are considered good. The bad: they create a middleman complication to you getting paid. That middleman hierarchy is made of people who can be corrupt. The UAW had at least 16 members arrested and charged with embezzlement, effectively stealing your union dues money.
https://eu.detroitnews.com/story/business/autos/2021/11/10/uaw-corruption-scandal-tim-edmunds/6368075001/
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