I have been playing SWBattlefront on the PS2 since it came out. The single player mode is good to get your feet wet... but even on the hard setting, it doesn't compare to some of the people that play online.
I would suggest getting proficient in all of the aspects of the single player mode... learn to fly (drive) all the vehicles, figure out the strengths of the different classes, learn to set mines, learn the maps and know where the supply driods are.
Once you get familier with this mode, plug in your high-speed internet connection and check out the action online... you can really find some great battles... and team mates. (watch out for the team killers tho, there are usually a few a night who are looking for attention in life, and like to upset others... just hunt them down with rockets or grenades)
There is currently a patch for the PS2, but it will load automatically. I believe I have received two patches since the first week, but I could be wrong.
Hope to see you online...