Today robots make the following kind of jobs:
Boring and monotonous jobs: Welding and painting in productions lines, cleaning houses and offices.
Dangerous jobs: cleaning radioactive waste or manipulating explosive material, military applications.
Jobs which require a superhuman speed and accuracy (in order to make it inexpensive): Assembly of electronic devices like cell phones and computers.
Jobs in inaccessible places : exploring another planet or the bottom of sea.
For entertainment, research and education: Toy robots, many universities use robotics to teach a lot of aspects of science, hobby robotics is very popular today.
The main improving in our lives due to robotics today is that it has allowed to decrease the cost of production of many ubiquitous items like computers and cell phones making them accessible for many more people.
They have started to be ubiquitous, there are around 800,000 industrial robots in the world (mostly of them in Japan, Germany and North America), and you can count millions of robot kits for entertainment and education.
The most important reason to use robots today is that Robotics is a newborn baby, and the important point is not what does for us today but what COULD do for us in the future, which is unlimited.