The GoodAfter downloading and installing the patches, it played without a problem. I enjoyed the realistic rebounding of grenades. The AI actually worked. The game played ok. The music could be disabled.
Later in the game, the story started to take on some depth. You found yourself working more towards the Strogg center, and the building design reflected that.
The BadThe dismal colors. The repetitive game play. Shooting, running, more shooting and running. The sound displacement wasn't very good. The repetitive use of sound effects and graphics became boring. The nonsensical mission briefings.
Unreal came out at the same time. In comparison, Quake II paled.
The Bottom LineA piece of history. A lot of great games like Anachronox and Heretic II were based on the Quake II engine. You're better off playing one of those.