Borderlands is an amazing game combining the fast paced tactics we all know and love from first person shooters, and the customization and leveling system from RPGs. The game is more than worth picking up for gamers of all kinds, though it does lean more towards the side of a shooter. The DLC is great as it definitely adds hours of extra content, at a rediculous deal, since each of the four add-ons are $9.99 on the Xbox Marketplace.
You need a HDD to install DLC, if you have one, you're good to go.
I would reccomend this to anyone who is really into general gaming, or shooters.