[martok2112]

Basically, when you start the game, you start with highly configurable missiles. But did you know that as you progress through the game, your missiles gain their attributes. But here's something even better. Let's say that you are playing through mission five, and you suddenly decide you want to replay mission one again. Whatever attribute points your missiles have gained throughout your tour will carry back into mission one...in other words, you can play mission one with more powerful missiles after you've progressed through the game.

Now, with that in mind...configure your missiles to emphasize power, and blast radius,...with agility if possible. With your missiles configured thus, you should be able to take down a few raiders with one volley, provided they are close enough together.

The best thing to do is use your missiles constantly. It greatly helps your weapons accuracy grade. Use lasers only on slow moving targets, or on raiders that you know you can nail. The more raiders you splash, the higher your rating.
The more chain kills you score, the higher your rating. Make sure you have a lock on your target, then let the missiles fly. Regular Raiders take about one missile at full power. Raider leaders, two missiles.

Remember to use your primary target button when a new threat arrives.

Also, the faster your completion time, the better the grade. I managed to score an A on expert mode.

Also, the cool thing is...whatever missile attributes you had when you complete normal mode will carry over into EXPERT mode. Is that not shaweet?!

I would say "use the Force" but...wrong franchise. LOL!

Respectfully, and with wishes of success to your endeavor,
Martok2112