WOW! What an insanely excellent game!
The graphics on this game are incredible! That is with a GTX560. There are different areas that are populated by groups of NPC's. They all are talking with noise and music in the background. The realism is truly amazing! If you have ever worked on a video game you will have a true appreciation for what the makers have created.
If I was going to change anything, it would be even scarier to walk through by yourself. The storytelling of the companion would be lost, but the increase in suspense would magnify the atmosphere to something truly terrifying.
The ammo and or weapons would need to be changed to. I found myself hiding behind the companion all of the time so I would not run out of ammo. Even if it was not realistic, I would rather have lots of ammo so I could spray bullets and kill stuff, instead of hiding behind the computer companion and watching him spray unlimited ammo to kill stuff.
I don't know if all current games have the same production values as this one, but Metro 2033 is truly a masterpiece from the graphics, storytelling, atmosphere, and voice acting perspectives.
If the game will not work, you might check to see if it was installed on the C: or a different volume. The game would not work at first with a "Physxloader.dll" error message. It was installed on a different drive from the C: drive, so I copied all of the Physx files from the C: drive to the Metro 2033 folder on the other drive and it worked after that.