Indeed it is difficult, and partly everything is open to criticism one side or the other. We have sent plenty of critics to “flat” bonuses, and several of the critics / alternates to Sejong ability are flat bonuses themselves, maybe with a bit of trade-off to the Seowong puzzle (that is also criticised by being so easy and boring -> I do not see how adding just a bonus to the malus the Seowon has to make its gameplay slightly interesting is really an improvement)
On the other hand we have critics Sejong ability has a lot of micro, and critics to it only triggers 6 times in the game. I think these two balance themselves out and are what makes Sejong actually a different experience: instead of little eforts during the game to exploit the leader ability, here you have 6 “events” you can plan, you have to work for, and which provide a “big” reward (and if not big enough, that’s just tweaking the % number). That difference is what I like of the ability, even if the rest of it, and the rest of the game may be a bit duller, you play Sejong to get these six “management adrenaline” rushes you won’t have (or will be more random) with other leaders.
Probably not the most attractive option for all, but we have plenty of community members that find dull militaristic leaders because they do not like waging always war, and otherwise others may find dull other abilities. I can get more views of Korea being shown would have been nice, but cliches are difficult to overcome for every civ.
