Pick out the healthiest and most viable looking seeds and have a go at it, if you're so inclined! I've taken seeds from questionable quality smoke before, and turned them into my own creation. Bear in mind though, I never took any Columbian dirt weed and turned it into an award-winning Blueberry strain. While you can produce something more potent than the original batch, it's not going to be genetically superior in any way. It'll still be the exact same strain that you weren't too sure of when you smoked it. The primary difference being that: you will not have destroyed much of the trichome content by compressing into bricks, you will have ensured that the buds were properly dried/cured, and will have probably provided a better feeding regimen than the original plants were used to. Etcetera ad infinitum.

It will still be the same plant, but you can make sure that it lives up to it's potential. When you're ready, and have some experience under your belt, you should invest in quality genetics and what a difference there is.