I read the following quote on Digital Foundry’s “The Making of Killzone 3” article:
“I think the exclusion of a few things like a complete co-op campaign, big vehicles, on-rails sections and a few others were things we felt would stretch us too thin. They’ve been on our wish-list to master for a long time and the time just wasn’t there yet for Killzone 2,” van der Leeuw explains.
So let me get this straight. Guerrilla Games wanted to implement “on-rails sections” in Killzone 2, but could not? Talk about a prime example of “less is more”.