I often hear people describe the story of how they became a Christian as boring, implying that it is not worth talking about. I've done the same. We seem to think that the important things in a testimony are the same things that are important to Hollywood movie producers- drama, dramatic moments, inspirational life change and a fair bit of sin (in the before part at least). On these standards stories of people who had Christian parents and came to genuine, personal faith without going through a rebellious stage or even just people who had a rather un-dramatic life both before and after coming to faith can seem a bit unremarkable and less worth sharing.
I propose we have how we determine a good testimony wrong. If we think about what actually takes place, it becomes clear that there is no such thing as an unremarkable testimony. The external circumstances aren't what is most important. The person has been reconciled to God and saved from his wrath (Romans 5:9-10), been set free from being a slave to sin (Romans 6:20), been adopted as a child of God (Romans 8:15) and received eternal life (John 3:16) just to name a few of the things that have taken place. When we look at what has taken place spiritually, every testimony is amazing and worth celebrating & sharing.