1. immersive authentic portrayal of the time period
2. variety in gameplay
3. expands gameplay beyond just spatial reasoning
4. characters are human - not idealized
5. immense cast of distinct character ; genuine humanity
In many ways I think LA Noire is well ahead of its time. Its in my top 10 games of the generation. Red Dead and GTA V get more appeal. I can understand GTA V for those who want to have reckless fun but when it comes to storytelling, LA Noire has so much depth. And tends to avoid the cliches of badass gun-toting hero slays the bad guys that we're so used to.
I hope in time people will look back and appreciate it as one of the 7th gens best games once we move past the killing-zombies phase.