Well, you could only pick two games and a lot of people went with LBP, Wipeout or inFamous. And that's not to mention the PS3 sold something like 30-40 million units since that hack, I'd bet most PS4 owners never played Dead Nation.
I did play it but it's a great game and I lost my (locked) save to a dead PS3. I'm actually looking forward to playing it again.
(oh, and as for Rayman, I meant to tell you this: you should probably focus on the "Never ending pit" challenges for the diamond cup - they don't require incredible skills, just patience and focus to not make any mistakes. Any of the 'go as far as you can' challenges should be good candidates though for that same reason).