New to Multiboxing - Mage vs. Warlock Trio

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Question to piggyback this thread: would 3x warlock be okay to use in a traditional tank/dps/healer dungeon setup? I would be okay with the talents being single target oriented or AoE oriented -- I'm mostly wondering how they might compare to mages (even if they are worse, how much worse?).

The thought of 3x warlock is appealing to me since they have so, so little downtime. Free water is great, but not needing to use water is even better. Even if my healer needs water and I have to pay for it, it ultimately feels like paying for faster leveling which is an okay trade-off to me. No time lost making water, no time lost consuming water.

edit: I almost forgot - I also like the small benefit of paying a little less for mounts for the group on the way up.