Here are some factors to help you evaluate if you should use raised beds.
Convenience of the gardener. If you love to garden but are handicapped or if you just prefer to not have to bend over as much in the garden tall raised beds can help. Raised beds can bring the crops up to make gardening more convenient for the gardener. As a gardener you will do a lot of weeding and plant tending so why not make it more convenient?
Pests! Do you have voles? Voles are these little tiny mouse-like creatures that love to nibble on roots. They will eat your vegetable garden from underneath. Don't get moles and voles confused. Moles eat grubs and worms not your plants. With raised beds you can attach hardware cloth underneath your beds and the voles won't be able to nibble their way through.
parterre layout and you'll have a garden the envy of every neighbor!
Here's another post I wrote about the benefits of raised beds. Every situation is different and a raised bed garden may not be absolutely necessary for you but consider your options!
Do you garden with raised beds?