It is no secret that Expose is a underused Elite upgrade. 4 points to add a red and remove a green, and costs an action. There are very few ships that it would even work on. I intend to provide a few ideas where this talent could be used. These are not optimal by any means, but are meant to be for fun and to show how it could work.
First up, we have the VT-49 Decimator. Chiraneau seems the best fit here. Expose makes him an even 50 points, and the loss of agility is ignored because in x-wing, you can't lose what you don't have. For an action you get a 4 red turret firing and if close enough you will convert an focus result to a crit. The downside, 50 freaking points with nothing else.
Next up: Omega Ace. Here is someone that could put expose to use, albeit situationally. If, and lots of *if* coming off this plan, you get close, have an a target lock, a spare focus token and an action you could get up to 4 crit results with expose at range one. The hard part is setting this up. You need to use a lot of points to get this going. Experimental interface or a wingman with Squad leader. Personally, I'm going to try it with Omega Leader as a wingman with Squad Leader when released. It could be fun. Darth Vader makes a good squad leader here as well. In either case, you have to be good at maneuvering to get a good chance to use, as the loss of agility on a fragile fighter could be detrimental.
Finally here, an unreleased Candidate: The Inquisitor in his TIE Advance prototype. He has an ability to treat all attacks as if they are range one. This makes him a very good candidate for Expose. Sniping at range 3 with expose on him means you are rolling 4 red, and the enemy doesn't get the agility bonus. When you are attacked at the same range, however, you get that extra green die, which offsets the penalty from Expose.
Now, I doubt expose will ever be a must have, or even considered optimal, but if treated like a type of ordnance on certain ships, it could help out. By that I mean you think of it as a one use trick, or at the very least, incredibly situational.