I'll give 4 stars to Hubler Acura on the South Side. I drive over an hour south just to avoid going to Tom Wood on 96th.
They hand wash the exterior, detail the interior and dust the engine whenever I give it over for service. (Even something as simple as an oil change!)
Also, they call and remind me when my services are do based on my recommended maintainance. Pretty cool considering my car's 17 years old.
Also, they give me whatever's the top of the line loaner for the day while they have it and also (as requested by me) do not drive the car off of their lot, even for mechanic test driving.