It sucks when someone destroys your Titanfall mech. But it sucks even more to safely eject, only to be blown from the sky by an eagle-eyed opponent.
This video from FrothyOmen goes over some advanced ejection techniques, including how to set yourself spinning in the air to make yourself harder to hit, as well as how to disembark from a functional mech much more quickly.
Here's another video on the air-strafe move from Gamesager, back in June:
While it remains important to climb into your titan with style, getting out with style is probably more useful for survival.