1. Persona 5 - Improved a lot from the previous entry and is one of the better JRPGs since Gen 6.
2. Witcher 3 - While I did not play this on the PS4 (played on the PC), it is by far the best western made game this generation.
3. Last of Us Remastered - Again while I did not play this on the PS4 (played on the PS3), this was one of my favorite games last generation. It is the best first party sony game has to offer by a huge margin.
4. Infamous: Second Son - The game that justified the PS4 for the first year. It was fun and entertaining. This was one time my favorite PS4 game. It is pity the genre of open world games has become too numerous and I am starting to feel the fatigue of it.
5. Super Robot War V - Now this is where I go pure subjective and personally pick the title I had the most fun with. It was a bit disappointing that Super Robot War X did not live up to this. This is far from perfect SRPG, but when it comes to the mashup, I think it might just by my favorite.