Having trouble beating the campaign on legendary for that sweet 125 gamer point achievement? no problem. here are some tried and true tips for finishing the fight.
1. play with a friend! this is the single best tip i can give. double teaming tough opponents is one thing, but the most important reason for playing with a friend or two is that you can make use of Halo 3's generous re-spawn system. As long as one player stays back at a safe distance the other two can rush and get killed as many times as they want!
2. stay back! if playing by yourself, stay in cover and slowly wear away your enemies.
3. try something else. if you keep dying and dying. try a different approach next time. most levels have a variety of paths to take or strategies to use. experiment!
4. have fun! don't get frustrated. if you are, take a break. my best advice is to put on some music and just enjoy the game.
everyone, feel free to add your own advice!