Once you finish 100% map completion with your main character, you get a star next to your name. Recently, I got so bored with my main character, the mesmer with 100% map completion, I’m leveling up the guardian. I leveled up my mesmer mostly by completing maps. This time, I want to try something else such as attending more WvW, and the dynamic events. I think doing map completion just to earn a star is not so worth it once you have done before. (vistas and tasks are not very challenging enough once you have done before)
It would be very cool if you have the 100% map completion achievement, all of your characters you create come with a star.