It was inevitable that once Sony made PS+ mandatory for online that the retail games would diminish most months. Combine that with having a new system in PS4 with not that many publishers ready to give up potential sales just yet and with Vita already offering most of its good retail games on the service at one point or another...yeah.
That being said if I was still using Plus (I refuse to because I refuse to pay money for online) I'd rather have Steamworld Dig, a game I own on two other platforms, than Knack.
The Smash thread is what it is. The game is gorgeous looking but not because of effects, it's mainly how well the art meshes.