Seems like a pretty potent combination no? If you get a crit, you get to look at it before deciding to use Integrated Astromech, so you stand a chance to ignore multiple crits this way. Even in the same hit - suppose you get 2 crits and if either one of them is pilot you can ignore both.
Luke + R2D2 + Integrated Astromech + Determination = 33 points but pretty impressive survivability. Is 33 points too much for an x-wing in this case though?