I Am Setsuna is an ode to JRPGs from the past. It's a top-down, turn-based RPG that really brings out the dark, depressing side of the oft-used genre. Unlike other games, I Am Setsuna is not a story about a charismatic young adventurer, or the chosen one. I Am Setsuna is a story of a young girl, destined to die.
Pro You can build your characters however you like
Characters in I Am Setsuna have their own active skills that are unique to them. However, there's a large pool of passive skills that can be used by anybody, which can lead to all sorts of interesting combinations. For example, you could have a taunting ability (something that makes enemies attack you) that also raises the user's stats, or a fire spell that somehow does cold damage.
Pro The characters aren't what you'd expect
The characters of most RPG are fairly standard. The hero who started from nothing, or the strong, silent adventurer, or the hyperactive, overly enthusiastic type. I Am Setsuna deviates from the standard tropes of the classic JRPGs, and lets each character tell their own story without taking away from the overall feel of the game.
Pro The combat system is familiar to almost everyone
I Am Setsuna uses a turn-based battle system that has been used in countless other games, bringing a sense of familiarity to the game. You're able to attack with your weapons, cast devastating spells, or even use combination attacks with your teammates. The combo attacks are particularly fun to use, as you'll have to experiment with different characters in order to achieve different effects.
Con It relies on nostalgia and story telling to cover up mediocre gameplay
While the turn-based combat systems of JRPGs have been going strong for longer than 20 years, it also means that there's generally nothing new to expect, and that is certainly true of I Am Setsuna. Fans of the genre will enjoy the nostalgic feel of it, but newcomers may feel put off by the slow speed and rather uninteresting combat.