How can you possibly justify making this argument when you're using a SMT avatar? How?
Because I'm a hypocritical faggot.
Sure they reuse a ton of crap but at least they make new interesting plots to go along with the recycled junk like the SAME DAMN 3D MODELS THAT HAVE BEEN USED SINCE NOCTURNE not to mention the general DESIGNS USED SINCE SMTII. I'm not happy about how much they recycle either but I tend to deal with it cause the plotlines are always interesting and engaging to me. Not to mention that it makes a little sense as the games are meant to take place in the same universe (although of course this doesn't justify it).
Final Fantasy IV, on the other hand, is recycling a plot, which just doesn't settle well with me. I found little bits of FF4's plot to be really, really good but overall the plot was leaning towards mediocre. I wouldn't really want to play through it again no matter how much they change the graphics or fixed up the dialogue or added little pointless-but-maybe-a-little-fun-I-dunno dungeons. Once you go through a plot once it sorta loses its luster on consequent playthroughs unless it has several layers such as a western RPG like Planescape: Torment.
Not to mention it has pretty minimalistic gameplay. If it had a funner combat system or some interesting features I'd give it another chance, but if it's the same crappy ATB attack->attack->attack system I'll have to pass.