There's quite a few for me actually- I always preferred watching a friend play Red Alert rather than playing it, and part of the fun of playing Driver was making replay movies to watch. Since then Though I've always been on the lookout for 'watchable' games, and I've found a few goodies. I've found a way to turn Perfect Dark into a gladiator arena sport you can watch without moving (and renaming teams gives the bots a lot of familiarity). UT2004's bombing run plays like a well balanced televised sport, too. Sega Soccer Slam even allowed you to pick two teams and put yourself in the spectator slot, so you could watch the whole crazy game of socer play out from the sidelines while you had a sandwich or something.
Also, I don't have good enough ping to play on US servers of Mount and Blade Warband and Battlefield 1942, but spectation online matches can be endlessly entertaining... especially with the chat log...
Also, I don't have good enough ping to play on US servers of Mount and Blade Warband and Battlefield 1942, but spectation online matches can be endlessly entertaining... especially with the chat log...