If I were in charge of the above group I'd change the cat to bear, the paladin to heals, switch the priest for the DK. Reasons--paladins are great 5 man heals and they are resilient. Cats have to be behind target all the time for maximum effectiveness, which takes extra babysitting. The DK is tougher and gives melee attack speed and attack power, the warrior can buff stamina and gives skull banner. Tw shaman buffs spell haste, spell power, mastery, and gives lust/hehero you'd end up with stats, mastery, attack power, melee haste, spell haste, spell power, crit, and stamina plus skull banner and lust/hero plus two toons capable of battle Rez. That's what I'd do!


but, to answer your question if you just want to switch warrior out for DK it's up to you. I wouldn't, I like my warrior, but DK probably easier to macro up. Frost is good easy DPS. Also, fury warrior seems way better to me than arms. But that's opinion only