This is a great classic - and in my opinion very underappreciated. Operation is a very decent dexterity game for children that also teaches them (in a funny way) about human anatomy. Also, children are naturally curious about the human body and find the theme great.
This is a real classic that is often not considered a proper game. However, Operation is actually a very good dexterity game for children. Children are naturally interested in anatomy and while some adults may find it strange/disgusting to be digging things out of a human body, children go at it full of enthusiasm - they get to play doctors with a "real" patient, and it matters how well they do their tasks. Operation teaches patience and attention to detail - but in a fun way that really engages children.