I must confess that I have no idea what people are talking about here. The ATS is very clearly marked with signs above the doors. On the occasions that there is a change, portable signs are put at the individual stops. Eventually a new sticker is applied to the ATS sign above the door. UA conducts all of it 'interactive' servies from T1. The sign says that much. A hand full of United flights leave from T2, the sign says that.

Once inside T1 there are monitors. Could there be more monitors, I suppose. if you think that ORD is difficult for foreigners, you have not traveled much in asia where there is ZERO signage for foreigners.

ORD could be better, but I have no idea how you did not know which ATS stop to get off.

On the other hand, nearly every week on the ATS somebody asks me when their stop is. I tell them and then point to the sign.