I was surprised the original Killzone ever got sequels. If it wasn't effectively a prestige project for Sony I doubt it would have gotten a sequel let alone a series. The first game is terrible, visually bland even by PS2 standards, uninspired levels, terrible voice acting, literally the same enemy over and over and over again. Insipid story, bad controls, hopelessly unsatisfying weapons. A perfect package of bland mediocrity that styled itself a a "Halo killer" that under any other circumstance would only be capable of committing suicide.