Well, lemme play the Palazzo role here.
Highlander is not chosen for its attacks, but for its debuffs, as he can reduce INT and SPR, ignore armor, Bleed (which some say is pierce damage). 2 ranks and you’re ready to go. You could argue that those debuffs do not work on every mob, and they really don’t. But they still make their job on the mobs he can affect, which is not a low number. So Highlander is a nice choice.
Concerning Barb, it is actually either 1 or 3, as like you say, Barb2 is not optimal. Barb1 is nice for Cleave giving 50 crit rate, which adds nicely to our chance and can be decisive if we will hit or not our delicious Epee. Actually, Cleave is the main reason and not Helm Chopper. It also increases 50% damage of slash, which makes Highlander more reliable for more time.
Those are the reasons people still take them.


