The final season was the best season IMO. Couldn't stop watching, must know what happens. They could have picked a better person to play Skyler but whatever. She annoyed me, nag nag nag. I'd never marry a chick like that. Pretty fugly too with that fish face.
Breaking Bad is the shit. I can only think of one episode that was boring, the fly episode.
Walt poisoned that kid to make Jessie think Gus had something to do with it. Plain and simple. There's no other reason. He wanted Jessie on his side, not Gus's. No other speculation required.