dclegg:
As a contrast to reven, I use my PS4 a lot. While its true that there aren't many killer AAA titles for it yet, I'm quite enjoying the indie titles that have been coming out monthly for PS+ subscribers.
As far as AAA PS4 titles go, my favourite game so far has been Infamous: Second Son. That was the first game where taking it through to 100% completion didn't feel like a real grind. It also does a great job of showcasing what the PS4 is capable of. Killzone also does this from a graphics perspective, but I find the gameplay to be rather pedestrian.
you should get rogue legacy, love that on PC. ive played it for 50+ hours, my 5 year old loves playing it too, he keeps asking me to let him "play the knight game". word of warning though dont rush through the bosses on new game + 1, in new game + 2 theyre very hard :D