Compiled a list of exclusive games that were on last-gen compared to this-gen after the same period of time, a lot more on the previous generation but most of them I wouldn't have bothered getting.
For 360 I'd have got PGR3, Dead Rising and Crackdown, XBO would be Forza 5, Sunset Overdrive and MCC. PS3 I'd have got Resistance, Motorstorm, Ratchet and Uncharted. PS4 I got Killzone, Infamous, Driveclub and Last of us.
Also there were FAR LESS crossgen games last generation so perhaps that sways people, though the difference is enough for me to want a ps4 rather than a ps3 to play those games on.
There's less options but I don't think i'd have enjoyed most of what was available last gen (some by experience).
Here's the List:
360
Kameo
Amped 3
PGR 3
Perfect Dark Zero
Ridge Racer 6
Dead or Alive 4
Full Auto
Moto GP 06
Over G Fighters
Chromehounds
Dead Rising
Saints Row
Crackdown
Fusion Frenzy 2
Dance Dance Revolution
XBO
Crimson Dragon
Forza 5
Killer Instinct
Fighter Within
Kinect Sports Rivals
Dance Central Spotlight
Sunset Overdrive
Halo MCC
PS3
Mobile Suit Gundamn Crossfire
Ridge Racer 7
Resistance Fall of Man
NBA 07
Full Auto 2
Motorstorm
Formula One Championship Edition
MLB 07: The Show
Ninja Gaiden Sigma
Warhawk
Lair
Folklore
Heavenly Sword
NBA 08
Ratchet and Clank Tools of Destruction
Time Crisis 4
Uncharted
MLB 08: The Show
PS4
Killzone Shadow Fall
Knack
Infamous Second Son
Infamous First Light
Driveclub
Last of us Remastered
The Order 1886
Essay Pro