I have driven by this place 1000s of times over the years. And, while the location isn't the best...
I found the staff to be friendly and prompt for service at this Diner (5 Stars). Our juices were delivered within a minute or 2 of ordering. And our breakfast (French Toast and Pancakes) were served pipping hot and tasted pretty good (4 Stars). However...
As others have said, the exterior and interior, is in need of a serious update. But, what was much less appealing to me, and the main reasons for a 2 Star rating: Thread worn carpet as you walk in, tears in the vinyl bench seats with no attempts of being repaired. And the bathroom, while "clean" was a turn off (mildew along the back splash) and the "baseboard" appears to have been installed by a 4 year old.
I usually eat breakfast at home. But, even if I did eat out regularly, I don't think that I will go back.