Hoverboard flag running seems suicidal. A single shot knocks you off the board, makes you drop the flag, and sends you sprawling to the ground immobile for a moment, during which the entire enemy teams which will no doubt be trailing your Marty McFly wannabe ass will grab the flag and pop a cap or a thousand in you.
I'm hyped for the game though, just for the campaign mode. Frankly, online multiplayer is only remotely fun if you're actually pretty good at the game. While I enjoyed UT, I wasn't all that good at it, which made online play less fun and more "Oh look, dead again."