Logan's death was badly done, but beyond that:
-referencing Thomas's statements about their intent: the strengths of Veronica Mars are very different from those of Sherlock, though even Sherlock is built on relationships--with Watson, with Mrs. Hudson, with Molly, lots of others. Taking Veronica out of Neptune is essentially starting a whole different show, and one that sounds a lot less interesting. Not to mention that VM has been able to engage with class issues in a particular way because of the Marses' specific place in the community. All in all, a bonehead move.
-the Keith health scare was badly written and badly acted.
-how is Daniel Maloof a free man, let alone running for senate? There is tons to connect him with the death of a relative of his brother's fiancee; by no means would it be written off as a simple race-motivated murder attempt. And how is crazy Mama Carr not on every local news outlet shrieking about her other son who's gone missing. I would think the Maloofs would have every reason to get out of Dodge, not raise their profile and run for higher office.
-Maddie and the ring? Come on.