For me it's been a decent year for ps4 exclusives, they appealed to me more than the xbone's, which is why I didn't get an xbone until last week.
Knack on Hard + 2 player co-op was tons of fun. On that difficulty, it was like a Lego game that requires more skill (and had some good boss fights as well), had deeper combat mechanics than expected. Really underrated game, I feel if they hadn't released it at launch it may have reviewed a little better.
Resogun was solid, and it was free with PS Plus.
KZ SF MP was fun, couldn't get through the SP though the graphics were gorgeous.
inFAMOUS Second Son - good, only the side missions were weak imo. The main story missions, the actual gameplay (powers, combat, traversal), the graphics, the music all lead to a good game.
The Last Of Us Remastered - Better version of one of the best games last gen, yes please.
Driveclub - Okay. I was mainly interested in playing this game offline and am not a big fan of open world racers. Like the gameplay, like the graphics environments daynight cycles etc. Sucks that they made certain cars unlockable only via clubs, so even though I want to play offline, the online problems they are having actually affect my experience with the game. Otherwise it would've been good. Due to free ongoing support my opinion could change.
These are just the exclusive that interested me, there are other exclusive games I didn't mention simply because this is my list of exclusive games that I liked in the first year of the ps4 Seems like a solid list to me.