tanks not using cooldowns?

[Gameplayzero]

mostly on mobs. On hard hitting mobs I remind them and only some use them afterwards (most I've seen use them and forget). I even got yelled at for asking while trying to do Holy spam. He told me to heal better and proceeded to slow the run down by stopping and waiting awhile before each pull. Is there something i'm missing or? I've nonstop have been getting this on expert and lower level'd dungeons. I get that expert is a joke when it comes to damage, but if you aren't stance dancing then thats somewhat lazy.

they are going through whole dungeons not using them.