Need for Speed: Underground is one of the better titles in the series. Also, one of the most atmospheric. Its got style coming out the ass.
Need for Speed: Hot Pursuit Remastered is an exciting action-packed racing game and the addition of cross-platform multiplayer is a big plus.
Need for Speed: Hot Pursuit 2 is a solid racing game that expands upon the series staple of high speed police chases.
Need for Speed III: Hot Pursuit contains a nice mix of high speed racing and awesome police chases.