I bought PS3 Rayman Origins for $20 at TRU waaay back when, so I wouldn't say $15 for DL is a huge deal, though I do realize there are those of you who prefer your games DL so have fun, it is a really fun game, especially in multiplayer.
That said, I'm really looking forward to Trine 2 as the demo was a lot of fun in 3 player and the Castlevania games and Awesomenauts and Rock of Ages. Seems like Sony is actually going out of it's way to make PS+ good, weird.