Dead nation is a game I'd definitely pay the full asking price for. I've played it for around 6 hours already and am just past the half way mark. It's a top down, twin stick shooter made by the same developer that made Super Stardust HD. The setting is just the same as most zombie outbreaks where you are one of the only survivors and you must fight your way through the infection to get to safety.
|Expect to see lot's of explosions|
|Example of HUD|
There is a story but it's not the reason you should play this game. You should play it because it's hella fun and extremely addictive. There's a wide range of zombie enemies to fight off each which need different approaches to combat and lots of loot to pillage! There's a main story campaign, separate mission modes, offline and online co-op. If you've got a PS3 and are still undecided on which 2 out of the 5 games your going to choose, I'd urge you to pick up Dead Nation as one of them.
As for infamous it's taking forever to download so I've not got much to say on that but I am looking forward to going on a rampage of destruction through the city!
Here's a video displaying some of the chaos you can indulge yourself in.