I never watched the show but I plan on doing a BB marathon soon. Does knowing that Jessie Pinkman becomes a bad guy ruin everything?
You probably mean Walter White. And no, it doesn't ruin everything, you more or less expect him to turn bad, it's hinted in the title of the show. But it's more complicated than saying "Walter White is a bad guy". It's how he slowly transforms and justifies his actions that are really interesting to watch. And Bryan Cranston is just so likable, you can't help but root for him despite some of the crazy **** he pulls. I definitely suggest you start watching it. In my opinion, it's the best original drama on television right now.