For me the launch games on PS4 don't warrant a purchase. You can buy the console for future games though.
I bought my PS3 and a copy of FFXIII, which sucks ***, so I just used it as a Blue Ray player till I decided to get Oblivion...which on PS3 also sucked ***, so I got it on PC and went back to using it as a Blue Ray player till Skyrim.
Oddly, I bought a Wii and Skyward Sword, played for a few hours and haven't turned it on since... A mouse chewed up the cord to my sensor bar anyway.