Breakaway -
https://www.youtube.com/watch?v=IEHAj3EmpMw - was one of my favorites, simply because it was fast-paced and offered more course challenges (hella high humps) than others. It also gave teams with lower resources a great chance to come up with a robot that could score well. Teams that were tech-savvy could really do well with camera-sighting and autonomous play.
I also liked the fact that we could easily transport this robot. Seems like they just get taller and taller.
As I recall, the spectator-friendly aspect to this game was emphasized. OK, now you can list the video of Guru Kamen getting the ball to the head....