I love Dillinger and I admit it got in the way of my enjoyment of Public Enemies. Milius' script is fabulous. And what a cast.
The film I think of the most as an influence on Milius is not Bonnie And Clyde but The Wild Bunch. First off, casting The Gorch Brothers as opposing leads is fabulous. But if you compare the action scenes of both movies (particularly TWB's first one) you will see Milius emulating a lot of Peckinpah. It's cool in a film-geek way because he didn't have access to home video then. He simply had to have paid repeatedly to see Wild Bunch in the theater and lots of those stunts, camera angles, and bursts of violence must have been seared into his memory.