Easily my favorite of the original trilogy. Gunplay is massively improved, boasting a larger arsenal and XP-based leveling. The incorporation of strafing is a great addition. The writing is even better in this game, being wacky and colorful to attract young players, while also being shrewd and cynical to attract the older crowd. Level design is even better than the first, the music is different but just as great as the first, and there is a lot of extra stuff to do. NG+ is also highly recommended.