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I can definitely see the point of wanting a darker end for Walt but I guess not everything still went his way anyway? I mean, Walt Jr. still hates him (although that'll probably heal in time). I pitied him a lot in the last two episodes but he was such an ass in the entire season that I wouldn't have minded him getting a sadder fate. And also yeah... he was way too lucky in the last episode.
I still can't get over how much hell Jesse went through.