Since my character reached about level 60 (now 70+), world boss fights all only last a few seconds and are zero challenge. They’re as short as 1-2 seconds (the boss’ health bar sometimes doesn’t even have time to appear) and never last more than 10 seconds.
I’m happy for the basically free loot! But, for a mob that you have to wait 6 hours to fight, it just seams the event itself should have more substance and require more competence than just spamming all your skills for 2 seconds.
(I play solo, so it’s always a random group with a wide variety of char levels.)