Warrior/Mage/Priest would be difficult due to the mage needing to face the targets plus with the /follow walking thing now there's an extra 5 seconds of them catching up to you (unless you have an easy way to break follow early if the warrior charges) That was my experience from doing my 60 war/60 sham/64 mage.

Tonight I'll give a war/sham/rogue group a chance, I don't think it would be that bad compared to a caster with a 2+ second cast time as long as I back up a little for the mob to get in the range of the rogue's melee. Plus windfury and chain heal in case the rogue pulls aggro where I can keep the group up.

I'm currently saving up for an x-keys pro and multicaster so I can start moving away from using software to broadcast keys and get rid of using the boring old ` to = with alt and shift modifiers for keybindings.