How do you define good condition?
Numismatic "Good" condition (normally spelled with a capital G) is in reality the lowest collectible condition. Coins graded Good are usually quite worn. In general, all important details (date, mint mark, denomination, inscriptions) are recognizable. There are specific things to look for on different coins to assign a grade of Good. If you get a book such as Photograde you can see pictures and detailed explanations of what defines the condition for a given coin design and denomination.