A great addition to the Fallout 3 saga that features a new and interesting area to explore.
In this expansion for Fallout 3, you must leave the Capital Wasteland and take a ferry to Point Lookout, a decrepit backwater region in Maryland, in search of a mother's missing daughter. If you can get past some minor framerate issues, then you'll discover that Point Lookout adds a decent array of new weaponry and pursues some interesting quest lines.
While the main quest has you mucking through a trippy bog and joining a backwards cult in search of the daughter, there are a couple of other missions of interest. One has you helping a hotheaded ghoul ward off violent cultists and getting payback on his longtime rival. Another optional one has you investigating an espionage mission of a dead Chinese operative working in the swampy area during the Great War. All in all, these quests along with other side quests will take about 7-9 hours to complete. That's not to say that that's all to do in Point Lookout, though.
The area features some new weapons, such as lever-action rifles, axes, and shovels. Also, keep on the lookout for some special weapon variants, such as the Backwater Rifle, the Ritual Knife, and the Microwave Emitter. There isn't any particularly useful armor or clothing, but the punga fruits that grow all throughout the swamps have an unusual healing effect, restoring a good amount of health and reducing the body's radiation at the same time. There are also three useful perks that are obtained from the Point, including one that increases damage dealt against feral ghouls (especially handy against those pesky Reavers).
The combat is fairly varied. You'll be pitted against a slew of mutated hillbilly swampfolk, swamplurks, and swamp ghouls. Some of these fights, even the normal, unscripted encounters, can become cumbersome if large groups descend upon you. It's recommended to bring a good crowd-control weapon with you from the Capital Wasteland, since your main-game companions are not allowed to accompany you to Point Lookout. It's also recommended to use stealth and pick off enemies from a distance with a lever-action rifle.
While most of the experience here is positive, one caveat I have for this DLC is the performance. As soon as I set foot on the pier of the derelict boardwalk, I noticed that my framerate took a decent hit. Granted, the miry and rocky environments of Point Lookout look great, but it's no more detailed and can't possibly have a greater draw distance than the Capital Wasteland, which maintains 50-60 frames per second at all times. In the DLC, the framerate dropped as low as 20 fps for extended periods of time. Even in enclosed areas, the framerate took a slight dip as well.
Eventually, I returned to the Capital Wasteland, inventory full of some great new gear and plenty of punga fruits. There's much to do in Point Lookout for anyone daring enough to board the ferry, and for $10 (800 MS Points) anyone willing to try it out will get his or her money's worth. I would recommend finding the Add-On Pack that includes Broken Steel (another good DLC, I might add), since you can generally find those for cheaper than the price at the Windows Live Marketplace.