I’ll only answer those that I know.

FFT
Strength: story
Weakness: art direction (though this is reaching as I feel that it actually nails down all elements. I’m using the PSP version slowdown to justify this)

Xenogears
Strength: Villains
Weakness: Gameplay

Witcher 3
Strength: Characters
Weakness: Villains

FFXII
Strength: Gameplay
Weakness: like with FFT, I feel all elements are super strong, so let’s just go with villains for the sake of picking something

FFVI
Strength: Music
Weakness: Gameplay

Chrono Trigger
Strength: Side content
Weakness: Art direction (see FFT and FFXII)