Reviewers cited many technical problems with Killzone, including inconsistent and sometimes nonexistent AI, occasional bugs resulting in random game crashes, frame-rate issues, numerous distracting graphical glitches, repetition of the same voices, short draw distance, and an awkward control system. Critics also complained about the gameplay, with IGN labeling it "underwhelming and mediocre" and Into Liquid Sky stating that it "needs more refinement". In light of these problems, reviewers such as GameSpy commented that Killzone was not the "Halo killer" that it had been previously hyped as before its release.