I don't care much for Hush, and I think overall Heart of Hush has been the weak point of Dini's run on Detective.
That said, the last issue is excellent; vintage Dini. It ties everything he's done together nicely, and would be a great place to end his run (well, other than the rather large dangling thread of [spoiler]Hush surviving and knowing where the Batcave is[/spoiler]) -- but makes me feel good about the fact that he's coming back in a few months (and apparently taking care of said thread).
I think the best part of this issue is the Batcave -- it has a presence in the story, like a character unto itself. I always loved the Dini/Timm treatment of the trophy room, and Dini cranks it up here by having every Batmobile on display -- "A car for every mood swing," as Hush puts it. As happened on both Batman Beyond and Justice League, trophies are used as weapons here. That and Hush's defeat is straight out of [spoiler]The Incredibles[/spoiler].
All in all, a really fun ending to a nasty, violent story, and it features a good chunk of the Bat-family to boot. The scene between Bruce and Selina at the end shows a side of both of them that we seldom see. And the pages that follow provide a satisfying ending.
Looks like O'Neil's doing a post-RIP arc next; that should be interesting. Then Dini's back in a few months. Should be good.