Unions did a lot of good at one time for low skilled work. They gave us the 40 hour work week and weekends. But mid/high-skilled union shops quickly turn to shit. The quality goes out the window and there's no merit incentive for very merit based jobs.
Not inherently. Some unions do put in specific rules about specific job levels having specific pay, but not all. It just depends on what the union demands in their negotiations. A more reasonable approach would be to demand a certain minimum amount of wage increase each year. Even in that situation, if management isn't willing to give merit-based increases because the total dollar amount including the mandatory minimum for everyone else adds up to too much money, then it could still have that effect, of course. Either way, rigid pay rates aren't a hard-and-fast requirement of union workplaces.
Some union shops also have rules mandating that nobody do anything that is someone else's job. While theoretically intended to prevent consolidating and firing people, those sorts of rules often end up making life miserable by limiting opportunities for advancement and career growth. But again, not every union does things like that.
The real problem with unions is that they are basically doing what the government should be doing, were governments not hopelessly pledging fealty to industry. But because unions are too close to the problem, they see only the employees' side of things, and over the long term, their demands usually end up outpacing practical limits, and companies close the plants and move workers to another country. This is not to say that they would not have eventually done that anyway, but unions often exacerbate the problem and accelerate the job loss.
If unions focused only on improving working conditions, limiting working hours, requiring reasonable minimum standards for termination, requiring voluntary exit programs before any layoffs, and other largely cost-neutral demands, they could make life better for workers by being a check on penny-wise, pound-foolish decisions without causing long-term job loss or other downsides. But the temptation to always ask for more money is too great, so this almost never happens.
