What does Fiverr do well? The Fiverr team make it really easy to find a gig, choose a service and get the work ordered. Delivery is just as simple. They've streamlined the process so that it's not much of a distraction from other work.
What does Fiverr not do well? There are definitely some bad service providers on the platform. It's not always easy to zoom in on the best option. Not sure if it can be solved easily though since the platform is designed to be low friction and high volume.
What do you wish you had known about Fiverr before using? Nothing really.
Have you used a competitor to Fiverr? If so, how does it compare? I use other outsource platforms such as Upwork. If I want a complex or important job to be done, I'd spend a lot of time writing about the job, vetting applicants and so on. If I want a quick and easy solution, Fiverr does that really well.