Now now, that's a bit harsh. Unions severed a good purpose at one point when the U.S. wasn't concerned too much about the workers of the country.
At the time, yes, they were a great innovation that promoted the worker's rights in comparison to the company.
But that was then, and this is now. Now it's a worker's market where if you don't like your employer or s/he treats you unfairly, get another job. Everyone has some marketable skill that can just as easily serve someone else.
Now, most unions are small companies unto themselves, whose eyes are always focused on the bottom right-hand corner of the financial statements and how they can increase it. And the downside to being a part of a union is that you lose direct control over the terms of your employment, benifits and bonuses and the like, because you're bound to the same decisions that affect all; which isn't neccissarily a good thing.
Of course, on the flipside, unions CAN provide a unified front to present terms and negotiations to said employers. One person telling you something is a point of view. Several hundred (or thousand) all telling you the same thing is another matter altogether.