How about this, for example?
https://forums.crateentertainment.com/t/2-h-physical-forcewave-witchblade-the-unstoppable-force-gladiator-crucible-farmer/43084
It’s one of the best builds for starters.
Sure, no build works great without decent items in GD - that’s the common rule. But that build doesnt require any “build-enabler” items to work, is strong, tanky, simple and can work even with mediocre gear. Also it’s very easy to level up.