Don't worry Yahtzee, FF6 really was the only FF that remains enjoyable as you get older and wiser. 5 and 12 are also good, shame we never got a proper port of that 5 (you know, when Ted Woolsey was making Square games worth playing) and 12 gets bashed so much for not being cliche anime tripe. I've played every other FF but honestly, these are the only two main FFs I can say beyond a doubt are great games. Sure, I ENJOYED 7, 9, 10, 13, and 4, but I don't think they were GOOD. More like very, very guilty pleasures.
Anyway, if you liked 6, have you played Chrono Trigger and Super Mario RPG? (SNES version, avoid DS) CT actually has likeable characters (probably all Enix's fault, when they were still good too), and SMRPG actually demands some interaction in its fights.