Tanks can't keep aggro.

[Reinha]

I don't have a dark knight so I can't speak for them, but sub 45 all warriors have are foresight, thrill of battle and inner beast (since vengeance is level 46.) Oh and featherfoot if they cross class monk. I guess they could rotate storm path on all the mobs but that usually doesn't happen at the start of the pull since they're busy generating enmity. What more do you expect them to do? (Berzerk and Bloodbath share a cooldown so I assume they're already being used together.)

Level 46 WAR has at least...

Bloodbath: 30s / 90s
Thrill of battle: 20s / 120s
Foresight: 20s / 90s
Convalescence: 20s / 120s
Inner Beast: few second duration
(possibly Featherfoot 15s / 90s)

What more do I expect them to do? Nothing. I expect them to use the above skills, but many of them don't. The biggest offenders are definitely DRKs and I'm talking Heavensward content. When a tank is able to have a buff up over 70% of the time (the above WAR example, not counting in IB) but their buff uptime is 0-5%, it does make me wonder what's going on in their head. I can understand the total lack of cooldowns during the first few dungeons but not at 50+ dungeons and especially not in expert roulette. One cooldown per pull is all I'm asking for but some tanks want to spare everything for who knows what situation. I feel it's a very common problem nowadays, more so than aggro issues.