The Leviathan Event isn't a bad idea. There's a new shadowy threat called determined to bring order at any cost. Lois Lane decides that what's needed to solve the case is to bring together the DC universe's greatest detectives. This is good...in theory.
The problem is that this is a case of way too many cooks. There are simply too many detectives running around, essentially clustered together in large groups, with some dominating and some just contributing enough banter that we can say, "Yeah, that character was in this comic."
Instead, we get a lot of build up and a few plot points about how dangerous Leviathan is and it's hard to care about any of it. The solution to the case is unsatisfying which makes this a pretty disappointing miss for Brian Michael Bendis.