1 man commando games like Splinter Cell and Project IGI.
Hitman is amazing. I highly, highly recommend it if you like stealth, freedom and creativity in a sandbox level. One of the best and most creative games one of the few that did episodic content right. I'm so happy IO retained the Hitman license when Square (the fools!) let them go.
Also, people just don't have the patience for it anymore and mp gaming has exploded tremendously within the past 5 years or so.