Just finished the game. Amazing. It just got better and better. The story was fantastic, characters were developed wonderfully, and there were plenty of VERY intense moments.
I played on Hard the first time through. Early on I questioned my decision, but once I got the hang of dealing with the infected, it was the perfect degree of difficulty to keep me engrossed. There were definitely times where I didn't think I had an ample arsenal to complete an encounter, but I survived. The game made me push multiple aspects of my play, most notably, strategy. Bottom line, "Game of the Year" for current gen consoles. I'm disappointed that I've finished.