I'm still relatively new to growing, having only covered 35 varieties (including 6 landraces). My outdoor growing has only seen three seasons. Mazar-I-Sharif was my first outdoor grow. Mazar is one of the most ancient hybrids around, exhibiting both sativa and indica phenotypes as well as CBD chemotypes. It's not surprising that it proved disappointing to someone who's probably used to F1 vigor, as the cultivar is hundreds of years inbred. If the plant failed to impress you, please consider that it is a truly nuanced breeder's plant that often gets brushed off by newer growers in the West. But if you manage to get a good pheno (which is roughly a 25% chance), it's unparalleled for a hard trip and makes an extraordinary F1!! By the way, there's no such thing as feminized Mazar-I-Sharif, not if you buy wholesale from Afghani merchants, i.e. if you buy the authentic, legacy seeds.
Of all my growing, I've only bred with a fem once (on purpose), an irresistible Kush bush. The result was lacking. What should have been a dynamite F1 flopped hard under ideal circumstances. I mean they grew fine, but the numbers... I run numbers on all my green buddies. The offspring of the fem seed had amazing THC at nearly 20% when crossed with a landrace sativa, very impressive, but the terpenes took a nose dive into a generic myrcene overload and the quality of the high suffered greatly, changing from "luminous and inspiring" to "meh, I'm tired and hungry". I'm not the type to trade a 16% THC and 0.5% THC-A sativa for a generic 20% THC sleepy semi-indica.
Like I said before, all I have is anecdotal proof. My own experiences, from buying a CBD sativa accidentally and wasting 6 months growing it, to getting complaints about the smell of my house when I was growing "Tuna Shit", a strain whose stench truly reflects its name. You ever get a poop-smelling Afghan or Skunk? Multiply that tenfold, then add fish sticks and furniture polish to the bouquet.
Anyway, I use regular stock because I like encountering males of my favorite strains, since I can use them for breeding. See, if a male can trick me into believing it's a big female, I'll usually keep it for testing instead of destroying it, taking it into the boys' room where it won't ruin my plans for its sisters. Now the recent spider mite issue really set me back, but I think I have enough progeny to recover. Looking at it positively, I get a chance to test a couple F1s, and grow a little something I acquired from
@BobBitchen
EDIT: grammar