I personally own most of the games in this month's PS+ lineup, but I'm glad people will get a chance to check out Sound Shapes and GoW Ascension!
Sound Shapes is one of my favorites. Great looks, great sound, simplistic but fun platforming that works nicely with the arranged soundtrack.
I thought GoW was more entertaining than a number of the reviews would suggest. Sure there was a lot of fatigue with the franchise by the time it was released, but if you like the GoW flavor of combat, there is plenty of fun to be had. The multiplayer was a weird addition, but it worked IMO.