I like their take on the 'trix. Just one (probably for game balance reasons) gripe about that is that you can never move further upstream than one node from your jack-in point. This is probably to prevent the attacking team from flooding all their nodes and running upstream in a mammoth assault wave. On the same token, the only way for there to be more than one defender in the same node at the same time is if the defenders were physically pushed back, then pushed the attackers back, thus granting them access to more than one jackpoint. Rare, but not out of the question.
It's pretty fun, too. Especially if you use the heavy guy, because the Fatman Fist weapon hits like a gravgun, so you can knock stuff around the level. Course, the gravgun would be easier...