Yep. As predicted, I was.
As soon as I woke up this morning, I downloaded the final episode of Serial. I listened to it while making coffee and feeding the dog and fixing a lunch for Laura. Besides the tantalizing and ultimately frustrating mention of the thin possibility that Hae was murdered by a known serial killer, the episode unfolded without any surprises, right down to Sarah Koenig's admission that, while there probably wasn't enough sufficient evidence for a fair conviction, she can't really make up her mind about Adnan's innocence or guilt.
Maybe this wouldn't have felt like such a letdown if the series hadn't been stretched out to such a length that even vague, unrelated rumors become fodder for investigation and interminable discussion. Serial was certainly worthwhile as an examination of what can happen in our legal system when a crime is prosecuted without rigor, but for me that aspect of the story was undercut by all the tedious minutiae.