Killzone 2 was nowhere near launch. it came out in early 2009. For the most part people really liked the Killzone 2 multiplayer, at least those who stuck around for more than 1 month. Killzone 3 changed the multiplayer to be more like call of duty, so it lost a lot of appeal and individuality. People are probably weary of killzone 4 because killzone 3 just reeked of them trying to appeal to the COD fanbase.