The SAAW is a good weapon to bring in certain situations, I agree.
Some instances that it would be useful in are:
- If you were involved in a squad utilizing the Transport to move everyone where they need to be and you want an active deterrent to hunting Gunships
- On defense at a flag/silo/titan that you want to deny Gunships or Transports ready access to
When you do decide to use a SAAW bear in mind that there are a few situations that offer a better chance of a hit when you fire that particular weapon.
As far as tips are concerned, you want to try to take the enemy pilots by surprise so that they don't have a lot of time to react to their audio warnings inside the cockpit. Ultimately the closer the ship is to you when you lock and fire, the better.
Try to take your shots when the aerial vehicles are flying directly toward you or away from you. The AAMs fired from a SAAW fly the most direct path on the way to their target maneuvering accordingly. It is possible for an airship to out-maneuver a missile due to the weapon's lower speed and average maneuverability. (A gunship being more agile and a transport being a pig wallowing in mud) This ties directly into locking and firing on a vehicle closer to you as it affords the pilot less time to attempt evasive maneuvers.
Generally speaking, you won't be blasting Gunships or Transports to Narnia at a 100% success rate with the SAAW. It's better used as a ward against those evil flying interlopers that wish bodily harm on your person and members of your squad. Use it as such and the weapon has served its purpose. A flaming pile of wreckage falling from the sky is just gravy on the proverbial poutine.