CS:GO has gone through its fair shair of poorly recieved updates, however the game is still very enjoyable. This is the definition of a good FPS title.

A free mod for Portal 2, this title is well developed, voiced acted, and was a very enjoyable experience. Worth checking out if you've played Portal 2.

Portal 2 took everything Portal did and improved it. With a great story, new multiplayer mode, updated graphics, this is one of my personal favorites.

A first-person puzzle game with a simple concept but a wonderful execution, Portal is worth a try, even with its predecessor allready being released.

TF2, a free-to-play game brings a delightful change to the FPS genre. 9 classes, plenty of weapons, and 100s of hats, TF2 is definetly worth a try.