Final Fantasy II
Best: Established Final Fantasy would be about reinvention
Much like the rest of the series, Final Fantasy II completely changes a lot of the core mechanics of the original game, such as retooling progression to not be about levels and instead about how your party would specialize in certain roles. In a way, Final Fantasy II established that the series would be one about constant evolution, and acted as an early tone-setter for each game to be significantly different than the last.
Worst: But some of those changes were divisive
It wouldn’t have been a proper tone-setter for what Final Fantasy would become if it wasn’t also contentious in some of its changes. That new leveling system contains some elements of RNG, which can make grinding unpredictable and sometimes frustrating as you try to spec your characters into specific roles.