I actually think the Final Fantasy games have been getting progressively better with time, maybe with the exception of FF13 (the third installment mostly).Square should release quality games on a consistent basis. Has nothing to do with PS, Xbox or PC. They peaked in the SNES and PS1 generation and then decayed slowly.
Final fantasy games have been embarrassing past the PS1 era. Even FFVII remake has lots of questionable decisions.
I think the actual problem here is they flooded the market with JRPGs which only served to compete against themselves. Also, I think that exclusivity hurt their release numbers as a third party developer.