Anyone who says the X-wing is fine because Biggs and Tarn are used sometimes need to report to Moff Jerjerrod for a better explanation of why they're wrong.
When's the last time you've tried using them, and have you tried them with IA?
I fly them literally all the time, albeit casually. Normally use Luke Biggs and Wedge with whatever upgrades I feel like using. They don't joust like TIEs or B-wings, they don't Arc dodge like A-wings or Interceptors, and they don't have a Turret.
Sure I can win games, but I always feel like I'm working against the odds, like I have to constantly be on my toes and can't make a single mistake. They're the lest forgiving ship to fly, which admittedly does change a bit with IA, but not really enough.
I've played once with IA, but it didn't really make an impression either way, as Biggs and Wedge both took enough damage to kill them regardless, and I didn't block any super-crippling crits (apparently the selling point of the **** card).
My problem with IA is that the X-wing still gets outmaneuvered and out-jousted, it just takes a bit longer to die while it's there.