A good monitor response time depends upon the purpose the monitor is used for. For example, a monitor with a higher response time is good if you use the monitor for casual surfing, reading, or binge-watching. But if you are into gaming and videography, the monitor with lesser response time is recommended. On average, the monitor with response time for a monitor used for gaming purposes should be 5ms or less. For monitors used for casual surfing, reading, or binge-watching, response time greater than 5ms is also not bad.