some bagseeds get a bad name.. after all, some of the most legendary strains known to man have come from random bags of bud.. think chemdawg, and therefore diesel...
chemdawg came from some bag of weed that the guy chemdawg bought at a dead show back in the 90's, and had 13 seeds in the bottom of the bag.. those 13 seeds have gone on to pretty much change weed as we know it today.. but they started life out as some random bag seeds.. i always love when people say that bag seeds will always be garbage..
the bad thing about bag seed is that you never really know what you're growing, therefore you don't know what to expect for flowering times, height of plants, size, yield, quality, quantity, potency, etc etc..
but given the chance to be grown out right with some love and care, bag seeds can grow into some really nice plants.. not always mind you, but sometimes.. that's another thing, bagseeds can be a gamble.. you could have the next chemdawg, or spend 18 weeks of your life growing some hermie prone mexican brick weed.. you won't know till you grow it..
this is why i like to buy quality seeds from quality breeders.. it cuts down on the gamble, and i can pretty much determine what my end product is going to be if i can give it all of its needs and wants and make it a happy plant.. i will know who tall it is going to get, how much stretch it's going to give, how much yield i can expect, etc etc..