Gen 6 was the last good one.
Still,7 had some good games,especially on the DS and PSP,these two were pretty fucking good.
But the Wii was a gimmicky piece of shit,the PS3 was terrible and the 360 was an Xbox and by extension shit.
But I want to say again that there are some actually good games on the portables,and they are cheap as dirt.
The DS has a strong library,make sure to play Ace Attorney,999,Hotel Dusk,Ghost Trick and Layton for your adventure fix,the Dragon Quest ports,The World Ends With You,FF4 remake,Shin Megami Tensei Strange Journey,Devil Survivor 1-2 (they are better on the 3ds though),Etrian Odyssey,Radiant Historia and Pokémon
for your RPG fix.
Also you may try Contact and Freshly-Picked Tingle's Rosy Rupeeland for two extremely unique games that take full advantage of the DS,especially Contact.
Then you have the three Osu and Rhythm Heaven for rhythm games.
Other random shit you should play are Flower Sun and Rain because it's batshit insane,Izuna 1-2 (roguelikes with a cute ninja) and Infinite Space.
There are other games that I don't remember right now.
As for the PSP,play for sure some classic Monster Hunter,Patapon and the Nippon Ichi games,especially Phantom Brave,it's way better than Disgaea.
Also try Riviera,Ys,Tactics Ogre and ZHP Unlosing Ranger vs Darkdeath Evilman.
I feel that the PSP is weaker than the DS in terms of library though.
If you're interested I can list some of the good games for Wii and PS3.