Back then I was kinda annoyed with the game (Master System version of FF1) because the final boss stage is hard as hell and I couldn't finished it.
But the music is so damn catchy, made me keep playing.
I skipped FF2 since the music wasn't as catchy as FF1, so I guess what I love most from the game was its music.
I finally finished FF1 last year, thanks to the M2's 3DS version of the game.
And finished 3D FF2 too and just realized how good the game was.