LA Noire: Watch the silliness evaporate

This morning, I finished LA Noire. As some reviewers have said, the good parts are truly brilliant, and the bad parts are teeth-gnashingly awful. The good news is, the further you get into the game, the more the silliness evaporates. By the last few chapters, the game is tightly focused on the main plot, which is very well-written. Unless you don't like mysteries at all, it's worth wading through the muck to get to the conclusion. But man oh man, why so much muck? Why the endless car chases, foot chases, shoot-outs, and time-wasting non-clues?