You should try playing them

. The original half-life is what got me into upgrading my PC. My first PC had a Cyrix CPU and onboard video. I played Half-Life in software mode and some spots the frame rate dipped so low it was unplayable. Then I started upgrading and saw the game in a whole new light. To this day I still prefer linear games for the most part, especially single player. Anyway, check them out, you might like them. Or not...