Far exceeds its predecessor in pacing and gameplay variety. Each chapter is distinct in aesthetic, gameplay motifs, weapon usage, and enemy patterns. No section overstays its welcome, unlike some of the parts of Half Life (and even Black Mesa). Truly a pinnacle of FPS design.

Also, shouts out to the sound design! Love that the Combine enemies have a flatline sound when they die. Really great non-visual kill confirmation that reminds me of the original DOOM's use of sound, though with a more minimal style.