since this game has slower paced battles i get time to watch dps when I'm playing tank roles and I have found a lot of dps do strange enough things that I can't even really understand what they're thinking.

Like tanking a single mob that only does frontal cones for AoE the black mage would cast one spell then run around for 5-6s then another spell then reposition again then one more spell etc etc
and this is not just picking out an oddball, this happens a lot.