Incredibly addictive, had me playing it until zone.com stopped supporting it.
An example would be Hero/Bounty/Jedi Fest, these are maps with a small base all around the centre of the map, these would be fortified with laser turrets and could be upgraded in the latter versions. In the middle of the map, would normally have super-units that could be captured if the middle was occupied by one side for a prolonged period of time. These units would be a decided factor in the match, and this normally prevented other players from base raping/camping.
Another would be City-Build, a brilliant scenario in which there would be plots of land that would be of different terrain and be separated by outer-space. There would be a huge area in the middle for the host of the match to control, this would normally be known as the senate and controlled the most powerful units and had admin controls. This is comparable to God & Jesus from StarCraft.
So you put in the great engine, graphics for it's time, gameplay and wonderful community and you got yourself a great game.
I would like to extend this message to LucasArts. Please make a next-gen sequel to this game, you would have my fullest support. I hope you already have this in the making. It's truly an awesome game.