Summary: The weakest of the DLC for the first Borderlands game. This DLC is definitely intended for co-op as playing alone feels like an overwhelming waste of time. Repetitive wave after wave of bad guys makes this one mediocre at best.
Summary: There's not much appeal here, and is my least favorite expansion of the 4. The character of Moxxi and the potential of this expansion with multiplayer are the only good points. Other than that, you're given a survival-wave arena style game that can be fun for an hour or two, but dries out immensely...
Summary: This DLC is the exact opposite of what Borderlands is all about. Instead of unique environments, funny quests, leveling up, and lots of loot, Moxxi provides tedious arena combat for meager rewards. The matches are way too long. The random modifier system can result in stupidly hard situations.
Summary: Totaly crap. You dont earn exp at all, you only get a few loot items at the end of a round... the only real reason to get it is for the bank and upgrades that are available to purchase. Stay away.
Summary: As many others have stated, this DLC takes probably the most lacking part of Borderlands (i.e. the shooting) and puts it in the spotlight. With no experience or equipment to gain, the core of the game is removed and make Moxxi's an unsatisfying DLC.
Summary: A good idea gone bad, unfortunately the arena combat highlights Borderlands major flaws such as: terrible AI, repetitiveness. Then, remove everything fun from the original by removing story, plot, quests,and loot - then add cheap randomizers to the encounters.
Summary: This is the perfect example of how NOT to do DLC, it adds nothing enjoyable and has no real value other than a way to play through a crappy Horde mode clone with your friends, it gives you three arenas and each one has 5 rounds each consisting of 5 waves and each wave is the same every time you play...
Summary: Fun for 5 minutes, then it's just boring and annoying. They didn't even bother to add new monsters or even try to properly balance the game for single players... Neither worth my time nor money.