I think people are too focused on ATC as being an auto-include. While it is arguably the best offensive upgrade, especially on Vader and Maarek; we are given several good options in system upgrades. Accuracy Corrector being another one. I personally have a soft spot for Sensor Jammer, it doesn't get enough respect. I've used it and R2-D2 on an E-Wing and SJ prevented more damage than R2 did (something like 4 damage I think).
All that to say that Advanced Targeting Computer is probably the best upgrade for the named Tie Advances (which is why it costs you 1 point instead of being free), but it is in no way the only upgrade that makes the ship worth it.
Just a month ago Vader with Outmaneuver and Engine Upgrade was considered a decent ship. Albeit, light on the offense department, but still viable.
You're not wrong; ATC is definitely the new toy we can't wait to play with. It's the shiniest of what's been spoiled so far and theory-wing loves novelty. I think Vader with Sensor Jammer will definitely be viable, but serves a different, less aggressive role than the ATC build currently in vogue.
Also, I suspect that among the unspoiled Advanced ship cards there will be pilots who synergize well with the other System Upgrade cards. There's still 3 we haven't seen yet.
Edited by LaserBrain