This game probably has one of the best singleplayer campaigns I have played since Bioshock 1. It takes a great turn away from the world of Rapture, while still maintaining the same atmosphere which I loved. The game feels a lot brighter than number 1 and 2 but has a dark undertone. The combat has improved hugely with the addition of the skyhook, allowing use of the numberous skylines around the city. It can also be used for exciting melee moves.
The game quickly makes you form a bond with the companion you have throughout the game, Elizabeth. This means you have a real feeling of dread when you are apart. She also adds layers to the combat by allowing the openings of different 'tears' which can place different structures into the battlefield such as cover.
Just like in Bioshock 1 and 2, enemies can be fought with both weapons and vigors (called plasmids previously). This means that fans of the series will already be used to part of the combat system, while newer players should not find it too difficult to adapt. There are appropriate difficulty levels depending on whether you are a casual or hardcore player.
The best thing about this game though, is the ending. The ending blew me away. As you progress through the storyline, you learn subtle things but even with this knowledge, few people could guess what would happen. The game mixes moments of combat and exploration to intensify the combat furthermore. I would recommend this game as it provides a fantastic escape from your everyday shooter game.
5/5 without a doubt.