Yeah I think Kokuga is straight up trash.
I think that's a little bit unfair in that ANY game is going to appeal more to a certain type of gamer (Except Dog Days. That's for everyone.) But I'll give you that the list did skew a bit JRPG-ish, so for someone who just hates JRPGs, well, yeah, not gonna be into those particular entries. Still, there's a reason those games show up on 3DS... that's simply where the best JRPG makers went to ply their trade, so that kind of game makes up a decent chunk of the system software highlights.
It's not really that out there to say that the 3DS Fire Emblems and Bravely Default are sitting up there among the absolute best in their entire genres across all platforms over the past decade or so. If you hate SRPGs/old school console JRPGs they are probably not going to be your cup of tea, but for anyone with an interest in the style they're shining examples of the best of the best.
Also, if you are going to criticize those kinds of entries I can't see how you would recommend Crimson Shroud (which I also noted!) as somehow more capable of being a must play for the masses. That's a game filling an even more esoteric niche that a lot of people aren't going to enjoy.
Hey though, PUSHMO has super broad appeal. So does Luigi's Mansion (underrated but excellent), really good remasters of the N64 Zeldas, and Mario (I forgot 3D Land and that prob goes on my list too). And more people need to play 3DS Shinobi, dammit.
In addition to Rudie and Felix's comments, I like the game but intentionally left it off because:
(1) I think for first person dungeon-crawly stuff, even on the same system SMT4 isn't as good as the Etrian Odyssey 3DS releases, and
(2) SMT IV: Final may well be superior even in its own series.
(3) If you're a big SMT fan, you might even be like me and enjoy the long overdue official English localization of Soul Hackers more than SMT IV.
Question: any Japan only games even approaching must have status? The only one I can think of that really upsets me that it wasn't localized was the Kunio Kun remake, and I know that's just my curiosity and the game probably isn't even very good.