For the early PS games like FF7, it really helps the graphics if you use a filter of some kind to blur. FF7 on a retina screen is going to look bad. Those old TVs softened and blurred all the edges.
*** FF8 gets a very mixed reception. It is loved by many and hated by many at the same time. So don't feel bad if you start playing it and dislike it.
Also, do not sleep on FFIV, FFVI, and FFTactics (PSP remake War of the Lions).