Just because the bud you got the seeds from were crappy doesn't mean the seeds are bad, I've grown bad seed successfully twice now. The reason why everyone hates on bagseed so much is for a few reasons. Obviously they aren't as good as seeds from reputable seed banks, but not everyone can go that route immediately. Clones can be amazing, but they aren't always around and there's the risk of them being bad unless you acquire them from someone you know and trust. Now with bag seed, it's not very likely that you'll grow the absolute dankest weed in the world at all. It's hard to find top quality bag seed because everyone growing top quality bud does everything in their power to prevent seeds, but don't let that discourage you.
It's entirely possible to grow with bag seed and it's definitely a lot better than paying for crap mids, just don't expect the absolute dankest weed in the world is all.
And if absolutely nothing else, I'm not sure what you're experience with growing is, but anyone who's wanting to try for their first time should definitely try growing bag seed. This way when it's time to get serious and spend some cash you have experience under your belt. My first grow cost me $350 and it was a colossal failure, I got like one ounce of terrible hay weed and might as well have bought an ounce at the dispensary for how bad I failed. However I got more than my moneys worth in experience, my next attempt was much more successful because I did nothing but research and think about what I could have done differently.
Good luck man.