I played them all in the last few years on the PSP.
"Clunky" is a pretty accurate word to describe all of them really. They just don't quite feel right these days.
Lacking any nostalgia my views were...
FF7 - Clunky, confusing plot, and generally dated as fuck. I finished it more to try to see what people saw in it than anything.
FF8 - Better story, still clunky, never finished though as got stuck on final boss and couldn't be fucked to grind.
FF9 - Wow, now this was a game worth playing. Great characters. a bonkers but fun story, and I just generally thought it was fantastic to play. And the ending was perfect.
FF6 - Seemed okay, but I got to one bit 5 hours in where I kept dying and just couldn't be arsed.
So in short, FF9 is fantastic even today, the rest I just feel are not worth playing these days. They aren't bad, but like Tomb Raider and Dune 2, they may have been amazing at the time, but just feel too clunky now.
Opinions arseholes everyone etc etc