The Famicom version would definitely test the limits of your sanity.
-"Why does my magic suck?"
-"OH MY GOD WHY ARE BATTLES SO SLOW?!"
-"Ooo, this seems like an interesting door, I'll just go in her-*ENCOUNTER*"
-"Why isn't my HP going up? I have to hit my dudes to get HP or something?"
-"JESUS CHRIST THIS DUDE JUST ONE-SHOTTED MY GUY!'
-"Why does Ultima only do a few hundred damage?"
-"WHY ARE THERE SO MANY USELESS SPELLS?"
-"WHY IS HALF MY INVENTORY TAKEN UP BY SHITTY PLOT ITEMS? ARRRRGGGHHH!"
And so on.
At least you can turn the Emperor into a Toad.
Can you get down to mysidia early in the original version? You'd be set if you can do that.
Once you get passed all the initial crap and find out how to exploit the game it's pretty fun I think.