Dobsonians give the best value for money of any telescope. They cannot be beaten for observing the most beautiful deep sky objects, with bright images and a wide field of view.
A Dobsonian is ideal for people who want a simple no frills scope with a lot of aperture. They are great for beginners because they can be set up in moments, and pointing the scope at night sky objects is simple and intuitive.
Advanced astronomers love them too because they can have huge mirrors at very affordable prices.