I wouldn’t necessarily count bushings and ball joints already installed as a plus in most cases anymore. The bushings will be standard bushings, not offset bushings, so I wouldn’t even use them to begin with if you’re running radials as you’ll want offset bushings to get a decent alignment with good positive caster. And then yeah, a lot of the low end ball joints out there right now are terrible.
Free isn’t a good price if you have to replace the parts and add labor to do it.
If they’re good parts awesome, but if you don’t know what you’re getting it’s a dice roll.