1. I do like infamous, though I rented it and then finished it due to the psn outage. I'm not really sure why I never got around to actually buying it truthfully. It might be because I had other games to play at the time then just completely forgot about it.
2.I'm not really a big fan of god of war so I can't really say. Killzone on the other hand I do like, bought both killzone 2 and 3. It's probably their to fill my shooter fix when I'm bored of other shooters. The killzone games are pretty good too.
3. I'm not really worried for their next gen versions. Killzone shadow fall is looking really good. The others should be fine to since santa monica and sucker punch are good developers imo.