If you like hack and slash games they're a blast. The first had a pretty decent story behind it too. The demo for II is available on xbox live and I believe the ps network. Don't buy it though. The first one only took like 8 hours to beat.
Do the games tie into the original story line fairly well?
The first one was darth vader having an apprentice which against with rules, that apprenticefqlling in love with a girl and turning on vader to help start the rebel faction. I haven't played the second one still so I don't know what the story is on that other than vader made a clone of the hero from the first one to again try to overthrow the emperor.