I've been looking at the Automated Repair Unit and it doesn't seem to be a sensible hull mod in any case.
5/10/15/25 ordinance points
50% greater speed for fixing disabled engines/weapons in combat
50% greater speed of repairs and CR
50% more logistics usage
Unlocked at Damage Control level 5
The ordinance cost is quite high.
The greater speed of combat repairs is somewhat borderline helpful, but not enough.
The greater speed of repairs and CR is only useful in rare cases where you need to do a lot of combat frequently and can't return to a station.
The increased logistic usage is an extra negative to the already high ordinance cost.
The unlock is late, and is under a skill that is typically not trained first, so it likely won't be unlocked until late in the game.
In the end, I can't think of a single situation where it would be a good choice to use (if anyone knows of one, feel free to post), and so I think it should definitely be looked at to improve its worth or reduce its negative effects, to make it a more viable hull mod.