I've had good widow, OG, and blueberry. Although I could never see how the widow got so popular (must be looks). I would say the most over rated strain are those where someone didn't choose from a large population. I know you can get lucky with one but surely not that often. Every pack I ever started had some that were better than others. Breeders should be more up front about how many seeds it takes to score a winner and growers should know that when they start a single bean or even a pack that likely does not represent the full potential. If I had a seed company I would not want people to start single because 3 months later a bunch of know it alls would be comlaining about how it wasn't that great. I've grown packs from Greenhouse (pre 95), Sagmartha, Dutch Passion, Reeferman, DNA, G-13, Soma, Dinafem, Cali Conn, TGA, Serious, friends myself and a few others. I think that great plants are really only 1 in 20 or even worse. When I buy weed from others I alway try to find out how many they killed looking for the good one and its kinda insulting to the breeders and the custumer to see some of the crap even named when I know there must be some good ones in there.
That being said I think the most ever rated would probably be the White Widow. I've smoked it and grown it and its an awesome plant with strong flavor and high, just not the flavor and high that I want. Although if paying top dollar from a stanger I would be glad to score some widow as it don't take much and don't taste bad. Also I grew a single dinafem Moby Dick and that was one of the strongest, easiest, best yeilding plants ever and it looked fantastic, smelled like a gas station and made people ask if I had anything else. After a perfect cure it tasted like lawn clippings and gas. And not that green immature taste but like you just cut the lawn and gas. Not good. But stoney ass shit and arm size cola of crystal covered nugs!