The second DLC for Borderlands is here but it isn't want everyone wanted it to be. Here is the review for it.

User Rating: 6.5 | Borderlands: Mad Moxxi's Underdome Riot X360
It is a huge colosseum battle that you fight in. But in this one all of the enimies are on the exact same level as you are. Which is really hard to fight against when you are going against them in the huge tournament, which is about 20 rounds. But if you die during it then you have to start all over to the start of the round. Which is really easy to die, since the enimies are on the same level as you are. This DLC pack is only good for co-op which can be a pretty big problem if you don't have anyone to play with.

Overall: This DLC pack isn't the best. I would encourage you all to get a different game or DLC pack. If you can only play this alone then it will be really hard for you to beat this DLC. But if you do have some friends to play it with then it could be a good challenge then.

Overall:
Story: 5.0
Gameplay: 8.8
Graphics: 8.8
Music: 8.9

Overall: 6.5