I have gone during the weekend, weekday evening, and weekday day...
I still maintain that the service is not as friendly, considering they charge more than other places.
They take quick photos and leave it to you to try and make sure the photos come out good (no trying to get the kid to smile).
I would reccomend going to different picture people locations.
Valley Fair is a crowded mall as it is, so maybe that's why this location is like that.