This site is very good for research and other cool stuff. It links between a few main parts. The web browser, image search, video searches, maps, and even a little email service. The only problem would be the fact that a small kid might search something in the image search and find something very bad. Just monitor what they search through the image.(The do have a thing that limites bad pictures. But a kid WANTING it could easily turn it off!) Overall It's very useful!
Good Site, Duh. If you don't want to be tracked then don't use the search engine. They gather information for their statistical machine learning mechanisms, which benefits its users as well as the company. Deal with it!