Killzone seems to be great from reviewers such as GT and IGN, and more than competent from most I read. I am sure the limited time was a huge factor in the game's score for some. But I am more than satisfied with what I read about it so far, especially from GameTrailers. Knack I think was a casualty of overreach. Both Studio Japan and Cerny seem to be undertaking quite a lot, so in this sense I agree with you since larger games are much more difficult to produce when you consider time constraints. Larger games need considerably more time for polish, and there are few exceptions that have escaped this at launch (Halo: Combat Evolved on XB, Rogue Squadron on GC).
I'm sure inFAMOUS and DriveClub won't suffer from this, especially since they were delayed. They'll get the polish they need to be good - great titles.
Playstation = The Beast from the East
Sony + Nintendo = WIN! PS3 + PSV + PS4 + Wii U + 3DS
