Well, I played since 2003. And I don't miss a single thing from the past. It was all terrible content and people should be happy they don't even have to touch it these days.
Of course most of my hate stems from playing Summoner, and if you look at all content before Abyssea for SMN, it can be summed up with Dynamis Relic Armor. You got some scraps now and then, like YY robe, Bahamut staff, but in general no content offered anything.
If only SE could actually balance out their updates instead of favor PLD, WAR, SAM, BLM in every single update. There are more jobs than 4 jobs in this game, even if the developers don't want to admit it.