I've started playing this straight after beating FFI and love the progression as a sequel. I find the dungeons easier than FFI because I can replenish MP unlike the first game but the story is pretty good for a game from 1988.
As for my strategy I'm with some of the other people who replied to this thread. Firion acts as a paladin-esque fighter, Maria sits in the back row and is primarily a magic user, whilst Gus fights unarmed and has some magic in his bank too.