There were a lot of good Japanese games that gen but they were all over the place instead of being concentrated in one or two spots like most other gens. Some of the biggest Japanese games shit the bed and then you had a group of brown Target blazer wearin, shaggy haired, thick rimmed glasses hipster indie devs and game journalists pushing the narrative on how Japanese games were bad. I've gone into it before, that Japanese devs had trouble adapting to the middleware-focused HD era, were moving away from home consoles to portables, couldn't keep up with the budgets of western devs, and working against the "new hotness" of western genres on consoles for the first time... but that doesn't mean there weren't still Japanese gems to be found.
Anyways some examples of games I liked from that gen:
PS3: Valkyria Chronicles, Trails of Cold Steel 1/2, Yakuza 3-5, Mamoru-kun Curse, Tokyo Jungle, various Atelier games, Tales of Xillia, Hatsune Miku: Project Diva 1 and 2, Ridge Racer 7, Demon's Souls
360: Lost Odyssey, Tales of Vesperia, Blue Dragon, Deathsmiles, ESPGaluda 2, Mushihime-sama Futari, Pink Sweets/Muchi Muchi Pork, Akai Katana, Ninja Gaiden 2, Virtua Fighter 5, Dead Rising, Child of Eden, Rez HD
PS3/360 Multiplatform: Bayonetta, Vanquish, Dark Souls, Nier, Binary Domain, Street Fighter 4, King of Fighters XI, Rez HD, Resonance of Fate, Star Ocean 4, Sonic Generations, Sonic CD (though this was ported by a westerner)
XBLA: Daytona USA HD, Outrun 2 HD, Radiant Silvergun HD, Guardian Heroes HD, Jet Set Radio HD, After Burner Climax
DS: so many to list, Radiant Historia, The World Ends With You, DQ4-6 and 9, Rocket Slime, Ghost Trick, 999, Kirby Canvas Curse, FF3 DS, Retro Game Challenge, Suikoden Tierkries, Retro Game Challenge, Meteos, the 3 Castlevanias, My World My Way
PSP: Every Extend Extra, Wild Arms XF, Crisis Core, Half Minute Hero, Ys1-2, Ys 7, Ys Oath in Felghana, Trails in the Sky, Lumines, Persona 3 Portable, Persona 2 Innocent Sin, Hexyz Force, Growlanser IV, Gradius/Twinbee/Parodius Portable
Wii: Xenoblade, Sin and Punishment 2, Mario Galaxy 1 and 2, New Super Mario Bros Wii, Twilight Princess, Kirby: Epic Yarn, Kororinpa: Marble Mania, Lost in Shadow
WiiWare: Cubello, Mega Man 9 and 10, Gradius/Castlevania/Contra Rebirth
If those games were released this gen (technically some of them did get remasters or up-ports this gen but bear with me
), owning a Switch plus either a PS4 or PC would grant you access to about 95% of the above and it wouldn't seem like there was a quality Japanese game shortage in the slightest.