It's weird a situation though - because going back to Cheers, had it not been for the breakout success of The Cosby Show, that show would have never found a mass audience. But unlike ADW, its audience seemed to deviate from Cosby at some point and it was never in the shadows of TCS once more people watched it. I guess it also had critical acclaim and Emmy's on its side, but those things can only get you so far at the end of the day.
The same with Seinfeld, had NBC not moved it to Thursdays, it would have never found a mass audience. Not only did it manage to become a hit on that night, but THE definitive hit of its era. But again, no one would ever classify it as a "timeslot hit" as it wasn't overshadowed by anything else.
That said, ADW did carve out a unique niche from its parent show - namely, it did out-rate TCS in black households and I believe was still the #1 show in black households until the end ( even when its ratings on Saturday were baaaaad).