This event feels totally underwhelming in my opinion. World bosses are a really bad way to spend your time in Guild Wars 2... they are really easy, you have to wait up to 14 minutes in between bosses and the loot is really bad for the time investment. Giving us RNG (0.0001% chance) rewards wont change that. Because you can play the whole week and never get anything worthwhile. I'm all up for tokens that allow you to choose your rewards however. At least with those you can actually progress towards something that's worth your time.