Personal taste and opinions have a lot to do with what makes a 'good' vegetable garden. We can all have our own opinion. Generally speaking, a 'a good vegetable garden' is one that is productive. That is, if your plants are in good condition, the garden is watered and maintained as needed, there have been no major pest issues, and the sun/weather has been good, you should have a productive garden as a result. A productive garden should produce plenty of tasty vegetables that are in good condition.