The first thing you'll be treated to is a view you won't quite be familiar to in Left 4 Dead. Sunlight, shopping grounds, gazebos, a wide array of diverse scenery all around. Graphically, the Source engine maybe showing its age, but on the game's highest settings you won't be complaining for long. You'll be far to busy slaying zombies to form a complex sentence anyway. There are a few things that often change in video games you've put a lot of time into that you didn't even realize needed tweaking at the time. When these things are adjusted even slightly they make more of a difference than the most pronounced changes. This evident in games like Uncharted 2: Among Thieves, and sports gamers swear that their favorite titles change year after year. It's debatable really. The casual observer will notice next to nothing has changed in Left 4 Dead 2, but anyone who's put in at least 20hrs into the series will see how small things have managed to wind up different, for the better in this case.