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It made us realise just how quickly time is flying when we learned that Killzone has celebrated the tenth anniversary of its Western launch.
Graphically speaking, the last decade has been kind to the PlayStation 2's flagship shooter, as its hard sci-fi art design still stands out and those detailed 3D environments needed minimal sprucing up when the HD re-release came along in 2012.
Killzone was hyped beyond belief back in 2004, heralded by the press as a Halo killer amid bold promises of heightened immersion from developer Guerrilla Games.
Many of its promises went unfulfilled, but Killzone remains a significant release for Sony as it pushed the PS2 hardware to its limits. Future sequels would do the same on their respective platforms, helping the series earn a reputation as a showcase for PlayStation might.
Although the PS2 era feels like only yesterday to us, playing Killzone in 2004 was a very different experience to revisiting the game in 2014.
Despite its sci-fi roots, the game offered an almost believable depiction of futuristic warfare, thanks to its technological prowess and emphasis on cover-based tactical shooting.
But we've come a long way since then, experiencing some chillingly-authentic military shooters during the next hardware generation, and Killzone today feels like a parody of its former self.
From its overly-macho soldier protagonists to its comic book-esque villains, Killzone has gone from an epic space opera to a pantomime show with big guns.
This is by no means meant in a disparaging way. The level of melodrama during cutscenes alone is almost comedic enough to justify dusting off your PS2 and revisiting the game, and it feels like a refreshing change from modern shooters that takes themselves a little too seriously.
Behind all of this, a robust shooter still resides. Peppering Helghast soldiers with endless rounds of ammo was always fun, and the bite-sized missions saw the game surge along with the momentum of a roller coaster; and these qualities make it replayable today.
However, the game always suffered from technical issues, including inconsistent AI, bugs, frame-rate issues, distracting graphical stutters, short draw distances and awkward controls.
Some reviewers were more forgiving of these problems than others, but they had a significant impact on its aggregated score and prevented the game from achieving the level of acclaim Sony was hoping for. Its issues are even more difficult to overlook today.
Killzone may have fallen short of its lofty expectations, but aspects of the game received universal plaudits, namely its art design, depiction of gritty conflict and authentic sound effects.
This praise, coupled with strong sales figures, convinced Sony to pledge its continued support to the series, and Guerrilla Gamers learned from its mistakes the second time around when it brought Killzone 2 to the PlayStation 3 in 2009.
The series reached its true potential during the PS3 era, with Killzone 2 and Killzone 3 taking the original's technological achievements to new heights while putting a bullet between the eyes of its imperfections.
Killzone remains an important property for Sony as it continues to use the series as a vehicle to show off its newest hardware, with its latest core instalment Killzone: Shadow Fall serving as a flagship during the PlayStation 4 launch.
From a critical standpoint, Killzone: Shadow Fall is a case of deja vu for Sony and Guerrilla Games as the game received a similarly mixed reception to the 2004 original, marked down for AI problems and a perceived lack of innovation.
Yet, if history has taught us one thing, it's that Guerrilla Games is capable of putting this kind of feedback to effective use and making the series stronger in the long run.
With this in mind, we're hopeful that the studio will deliver a PS4 sequel worthy of the Killzone branding in the future.
Do you have any fond memories of Killzone? Post a comment below!