A better way to tell if someone is lying or doubting

More diversity in the cases. Three times as many of them as well. At least. Add a second dimension to interrogations (say, a more good cop/bad cop dimension, to give us some say in the attitude we take with suspects). A bit less hand-holding with evidence (give us some red herrings). Ability to revisit crime scenes in cases that are somehow connected to each other. Missions that aren't cases, to flesh out the private lives of the characters. Less open world, and instead give us larger, more detailed crime scenes. Fewer paint-by-numbers chases. Better shooting set-pieces. Less boring driving. Drop the stupid collection bits. Give us some real RPG elements instead of the superfluous leveling system the game offered. A better story with a better ending.
 
And that's just off the top of my head. I enjoyed the game, but it really needed to bake a bit longer before they released it. It still seems like the game was an excuse to put out this accurate model of 1947 Los Angeles that they built. It's an interesting concept, and they have some great tech in the game, but in many ways it feels like a tech demo.

Cole Phelps having a fucking life. 
 jumping from one investigation to another constantly, doing the same song and dance, killed the game for me. You don't do anything else.. 
 

sheesh...if you guys wanted fucking GTA then go play some fucking GTA.  There are like what 4 or 5 of them?  LA Noire is a cop procedural adventure game with 'some' action.  I can't believe that everyone came to it thinking it'd be the same crazy openworld do whatever you want game.  This was developed by a company who hadn't made any of the previous GTA games, Rockstar only picked it up to publish it.  I think the Rockstar name automatically means fuck shit up in a sandbox world to everyone. 
 
That being said I would have liked more cases that weren't all the same guy in the end, yet you wrongly arrest like 6 wrong people.   It was totally unsatisfying to work through whole cases and "figure out" who did it, only to have all of them be one guy.  I hope there are more DLC cases to come.

I hope there are more DLC cases to come.

@FoxMulder said:

I hope there are more DLC cases to come.

Two are in the pipeline. The 'Nicholson Electroplating' arson case (coming this Tuesday) and the 'Reefer Madness' vice case (coming July 12th). So far, it seems that there won't be any more DLC cases after those two.

Nolan North's face.

ah well that's lame...I bet if it was Rockstar who developed it we'd have some sort of crazy spinoff like Red Dead had with the Undead Nightmare stuff.

Hmmm...Batman?

physical interrogation. mostly involving the abuse of genitals.

or lady criminals. they were severely missing from LA Noire.