Season 2 is the worst season, IMO. Gets better and better from here.
I agree the plane crash ending was silly. Though it is interesting. Walt initiated the sequence of events that caused it, but that sequence of events was so random you can't really say it's his fault. It served as a way to remind Walt of the consequences of his action but in a sort of ambiguous way.
Like I said, if you have trouble rooting for characters who aren't good people, you will have issues with BB. For me at the point you are at, he's getting less sympathetic but MORE interesting.