PSP: GTA Liberty City Stories
DS: WarioWare Touched!
360: Gears of War
PS3: MGS4/LBP, then Uncharted/Killzone/Yakuza/Demon's Souls/Journey
Wii: not even sure, motion controls maybe
Vita: Uncharted GA, Gravity Rush, Sound Shapes

360 for halo 3, glad I bought it because of more games than i can remember

bought PS3 for Ratchet and Clank Future: Tools of Destruction. Glad I bought it because I loved Infamous, Uncharted, Resistance 3, LBP, HD collections, Journey, Flower, Unfinished Swan, PSallstars, Heavy Rain, God of War, and soon Sly, LoU, Beyond, and Puppeteer.

PS3 - Nothing really aside from the fact I wanted a bluray player for my HDTV in 2007. Decided to move on to Gen 7 with this console (because of bluray capabilities) and I happened to buy Uncharted Drakes Fortune, Ratchet & Clank Future ToD, and Assassins Creed with it. As far as later releases, I guess I can say Demons/Dark Souls and Uncharted 2.

PSP - Nothing again. I got it because it was a neat portable playstation! Perhaps half the time it was used to watch movies and listen to music. MGS Peace Walker made me glad I bought it.

DS - I no longer have it but I got it for Pokemon Diamond.

Wii - Donkey Kong Country Returns and other Nintendo games.

Generation 8

Vita - Uncharted Golden Abyss and the library outlook at the time of announcement. I have more than a few games for it but nothing has made me really enjoy the handheld like my Gameboy Advanced(s).

3DS - Super Mario Bros 3D Land. Mario Kart 7.

WiiU - NSMBU.

Ps3
i bought that one for ff versus.... (and ff13)...
glad i got it for the AC's up to brotherhood (a little dissapointed with the latest entries), Dragon Age (yes i liked the second one), little big planet and lots more.

Vita
Mainly bought it for psp games and was a little dissapointed that crisis core wasn't on psn...
glad i bought it for Lbp vita, uncharted, sumioni, Persona, gravity rush, and more.

PS3: I bought this as my main platform first. It was for Final Fantasy 13 which I thought was excusive and for GTA !V. GTA IV was badass for online play with friends and yes I enjoyed the Nikko's story and game too. Final Fantasy 13 was the biggest dissapointment of the GEn for me. It is really bad.  As exclusives go I liked a lot all the Uncharted games, both infamous games, Little Big Planet, Heavy Rain, Killzone 3, Resitance Fall of Man, Motor Storm: Pacific Rift, and many more mostly multiplatforms.

360: It was bought for exclusives which were origanally Mass Effect, Gears of War original, and Bioshock. Later of course only gears remained exclusive. I love it for Alan Wake, Left 4 Dead and The Witcher 2. As well as a lot of Multiplatform games.

wii: I bought it for Zelda: Twilight Princess, Mario Kart Wii, and Super Mario Bros Wii. The only one I really like of the 3 is Mario Kart which I still Play. Twilight Princess is the worst Zelda I have ever played. There are games I would want for it if I had the time. But two consoles is more than enough.

DS for Pokemon DP, although I bought it a while before they released.
Wii for MKW because I'd totally fallen in love with MKDS by playing it to death waiting for Pokemon to release.

360 - Bought the bundle with Crysis 2 and Forza 3
- Glad I bought it for Mass Effect, all Gears, Daytona USA, Skyrim, GTA4, RDR and the CONTROLLER

DS - Bought M3i
- Glad I bought M3i

PS3 - Bought for God of War 3 and GT5. I'm glad I have it because of Metal Gear Solid 4, Uncharted 3, Resistance series, Twisted Metal, Splatterhouse, LBP, Mortal Kombat and WWE 12.

Vita - Bought it for Tearaway and Killzone. Glad I've it because of Gravity Rush and LBP Vita.

Bought 360 for NHL 07. Happy that I bought it: A lot of games.
Bought Wii for .. i don't know, just bought it. Happy that I bought it: Xenoblade