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I really like how the game makes teams change their design strategy. It seems that in previous years, the approach to chassis design has been to make the beefiest, strongest pushing machine. However, Overdrive requires a very different approach. This not only forces teams to broaden their horizons and consider other aspects of chassis design; it also seems like it will level the playing field a bit. Instead of veteran teams improving upon tried and trued designs while rookies are learning the basics, the older teams have to take a few steps back and learn same new things as well.
Overdrive also seems more spectator-friendly. Most everyone understands the concept of a race, so it's easier to understand what is going on if you haven't read the rules. There also seems to be something appealing about the concept of robots throwing giant balls while traveling at high speeds...