Some of the best weed ive smoked was not known strains. Got some shit my buddy calls "Stacys Mom" (he crossed a male bagseed with Big Bud. )Definitely the highest yeilding plants i ever saw in person, and one of the smaller phenotypes had a really odd reddish color but was some bomb ass weed. Up there with the best ive ever smoked. I think he only got about 20 grams off that plant, and most of the other phenos were just average. (Massive yeilding though, i think he got about 7 ounces off three plants. No Lst, just used stakes to support it and a 600w MH for veg and 600hps for flower. I also have bought weed that is just sold as "Nugz" that has been better than White Widow, Afgan, and alot of other strains that seem to be known for there dankness.
By far the best weed i ever smoked was the bagseed i planted for my first grow. Its always better when you grow it yourself. Genetics make a huge difference but even with solid genetics, the growing process is more important. Ive seen bagseed from schwag turn into Grade A+ weed, and seen clones and seeds from some powerful strains come out as schwag.