If you liked Lost but never finished breaking bad i wouldn't even know where to begin.
I watched all of Lost around the time it actually aired and after 2 seasons I got pretty fed up with every question being answered with only more questions and even though the unpredictability was charming in a way i found it a pretty cheap excuse to just do whatever they could come up with.
I'm actually quite surprised your boy can handle lost. Pretty sure my 10 year old wouldn't be able to handle it unless i'm prepared to face severe sleep deprivation.