First off, I've been lucky enough to avoid the installation and startup issues that mean a lot of people can't play the game. I have had a performance issue which rendered the game unplayable which I was able to fix using '-str' in the command line, and the game still runs slowly all things considered.
The game has been out for some time now on consoles and has been well covered elsewhere. You can view it as a scaled back version of the city and driving aspects from the GTA series but with a more narrative driven missions. Shooting is similar and uses a cover based system that doesn't work especially well and there's less to do in terms of distractions which I prefer to the sprawl of GTA and it's side missions. I've marked it down in terms of fun for a few reasons. The missions become very forumlaic after a while, drive to a location, search it/question a suspect, repeat. Fortunately, the content is excellent and keeps you invested in the outcome of the case. There is also the occasional shift in tone or a mini-game style sequence, and while these don't always work well the variety is welcome.
And while the writing is pretty good, some of the questions and clue combinations seem fairly random. Ask a guy about selling stolen morphine and the fact you found a load hidden in his office throws up a fail if you put that to him. This boils some questioning sessions down to trial and error, and with no quick load option it gest tiresome. There are some really inspired moments in the game and it's entertaining enough to keep me from finishing Arkham City. The bonus content is a nice touch and 5 extra missions is not to be ignored in this age of being charged for costume packs and skins. If you liked the GTA series and enjoy hard boiled detective stories, LA Noire is well worth getting. Just be warned you may not be able to run it without problems.