The attached video will show an easy, zero-risk method for utilizing poor pathfinding AI to easily dispatch all three giant club-weilding Barbarians near the Valley of Drakes / Londo Ruins entrance to Blighttown.
All you need to do is get their attention, then run back to the ladder that goes down into Blighttown and climb down a rung or two. The Barbarians will chase you, then fall to their deaths when they get to the wooden walkway. I was never able to get more than one of them to follow me at a time, so if you want to kill all three of them using this method...
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