Never actually played an FPS campaign before, so a lot of this is very new territory to me. Regardless of that, I had a ton of fun with it, especially because I played it multiplayer with a friend of mine who loves this series, and it's not hard to see why. I went in with low expectations because the game is kind of old, but I was pleasantly surprised with the quality, whether it's the campaign, the guns, or the level design. Now that's not to say it was perfect, I did have some nitpicks like not being able to zoom in with certain guns and I found some of the controls to be a little weird, but I got used to them. I think the only main flaw that brings this game down for me is that some levels have really repetitive design. I know I just praised the level design a bit ago, but sometimes it can be a little lacklustre. Some missions drag on for a long time, which can work in the favour of some (Assault on the Control Room) and really ruins others (The Library). The Library in specific was really monotonous and definitely was the only mission I actively disliked. Back to more good, I really like the application of music and set pieces. The beginning of The Silent Cartographer and the very last part of The Maw were really highlighted by the great main theme and intense action. My personal favourite missions were the two I just mentioned, Assault on the Control Room, and Keyes. The ambience in the game is also really well done, being really creepy when it needs to be but also the game is really epic as well. Overall, a very solid campaign for a game I didn't know much about, and now I'm really excited to go to the next games as well.