The way I see it:
(Halcyon's unofficial AH2 rules)
1. Fly courteous, fly fair (no cable pulling, terrain glitching, etc.), fly fun. Doing the first two ensures the third.
2. Ask permission to help teammates. If the don't need it, don't intervene the dogfight.
3. Respect your teammates. Don't insult them or others, because you're just burning your bridges.
4. Mind your surroundings. Cutting off someone in a furball usually gets them killed.
5. Respect the radio. It's a privilege, not a right.
I've follow these rules everytime I fly, and I always have fun.
(just to note, score means jack in this game. Shooting disabled aircraft tells me you're a score potato and automatically turns you into a dweeb)