Some questions about raid tanking

[Taeluuin]

I've noticed that taunt does NOT work how it should here. Taunt is supposed to give you +1 hate over the highest threat in your group/raid. However, even on success taunt doesn't always give you threat. So what I'm curious about is this: do raid guilds use Knights on their MT list? Or are warriors still the only MTs for all raid bosses? If so, how do you manage threat?