The biggest mistake they made was making stores so big, and filled with 100's of display devices that now it's just almost entirely full of tire kickers taking up room and people that actually want to buy get pissed an go elsewhere.
There is no 'experience' there anymore. I can go to my local big-box store and buy apple products in 10 minutes, often cheaper as well and feel like i'm missing nothing.
I used to always buy at Apple stores, I avoid them unless no other resellers have something I need or order online. Service is why I go and the last time it was painful. I don't know why they eliminated the greeter. Even without genius bars you can be routed to the appropriate area and or person to help you. I have 6 Apple stores within a 30 mile radius of my home. Generally to buy I will order online at Best Buy and pickup at a location 5 minutes from my home, I do get discounts and points and no hassles whatsoever. iPhones are easier to get at an At&t store they will deliver it to your home the same day. I do like what she did with the look of the stores. The flow for customers and service/sales changes are horrible.