It isn’t low-g, you have a jetpack. If you hit the ground at the right angle, you “ski”, building up speed. It’s a CTF game, so cappers try to hit the enemy flag stand at ludicrous speeds and then find a route back to their base.
It’s the first FPS I played that had the notion of a generator. Each base has a generator that powers turrets, sensors, force fields (that might be a mod), and inventory stations.
In theory a team has to work together to take down the enemy’s generator so they can get to the flag stand. In practice nobody gives a shit after the generator is destroyed so most games end up as running battles around the flag carrier.
It’s not a bad series, but the official map builders never seemed to get the balance between base maintenance and flag control right.