Yes! We needed like co-op horde 4 player or whatever alongaide the PvP.... I'm guessing budgetary reasons?Apart from the obvious character design complaints. I think a traditional campaign and like you say PVE should of been a must if they want to reach other genres and even MP.
I like Killzone 2, dont like hermen lol.
A short 6 - 8 co-op campaign would have went dope too.