In your opinion, the original reports of TestNG are (pick one or more options):

1. showing too much information,
2. showing not enough information,
3. not showing what you want to show,
4. require too many clicks to find out what has gone wrong,
5. not very pretty,

Because of this, you finally decide to create your own reports. Good, then read this post, and you will learn about one possible way of achieving this.