Half-Life still holds up quite well for its age. The gameplay and gunplay are solid, the action is fast-paced and downright chaotic at times which is fun. The story's good, the atmosphere's great, the music's great. I had some gripes with it, enemies being spawned directly in front of you is pretty annoying, grunts are a special kind of obnoxious, occasional spontaneous death stuff. The end levels were a bit dubious, I'm not a fan of the fast-paced combat on paper-thin platforms, but other than that still pretty fun the entire way through.