One of possitve effect of Robots is that it can be used to do very dangerous task instead of putting a person life at risk. They were made for human aid, but most of us become dependent and become lazy. Another negative effect is that most of our manpower were replaced by robots because of high work efficiency.
I would not really call it just dangerous task, but can actually do more than any human can do as programmed and even faster without complaining of a raise or giving excuses of not coming to work and we both know that no company owner will not prefer to go for that. Unfortunately, this is the case and there is nothing anyone can do than to just adapt to the situation of life, see how to do something else with their life and move on. It is life, there are so many opportunities than factory jobs, it just requires staying smart, let's face the truth.
The biggest advantage of using robot is that robots can do a work very quickly and more accurately than humans if they are built in a right way, also they perform jobs free of coasts but on the other hand robots are decreasing job opportunities for people and also it is damaging humans health because now a day people relay more and more on machines and are becoming useless themselves