I have to disagree with the first two reviewers, even though everyone is entitled to their own opinion.
My experience of the game was made more difficult by the fact I had the Polish language version, I was working over there at the time. I don't speak Polish so in game info was useless but I stil managed to progress and complete this title.
As to the game itself.
If you prefer FSP's where you load up and keep every new weapon as you find it (HL and Quake/Doom) and it is just a case of generally blasting through then this title is not for you.
If I remember correctly you are limited to two main weapons. There are a variety of weapons throughout the game and not every section has each main weapon or ammo for it. So you have to think about what you use and carry through.
The snipers are annoying but that is the point. They are not positioned haphazard but realistically covering a specific point and as in real life are deadly. This presents a challenge, which again is the point.
There is quite a variety in the areas/sections giving you different challenges to overcome with some set pieces to add to the mix.
There is a good story to the game with a twist or two at the end. This adds to the overall fun factor and as I said early if you only want a blaster then forget this.
Overall a good game which is fun and challenging.