So, I've just started EFLC, however, since there are so many reviews talking about how this game is broken and does not work, I wanted to give my initial assessment.
The game works fine. It starts just fine, and both, Rockstar Social Club as well as Windows Live are working for me. I have had accounts for both networks for a number of years and they still work. The game runs smooth, better even than GTA IV does, although not by much. I had no problems changing the resolution, changing any of the settings in fact, and it even automatically imported most of my control mappings from GTA IV.
I will write more about the entire game and its storyline once I had a chance to play more, but I wanted to write this much, to counteract all the negative reviews of people claiming the game is broken. I have not experienced any of these issues.