Downloadable Content
(Multiple Platforms)
Best
Left 4 Dead: Survival Pack
When Left 4 Dead first hit shelves, people complained that two of the game’s four campaigns were unavailable in the versus mode. Thankfully, Valve is awesome, and has not only doubled the amount of versus maps in this Survival Pack but also included an all new mode. Survival locks your team in a confined environment where you must stay alive as long as possible while a never ending horde of undead nightmares pile in from every available opening, offering all new ways for you and your buddies to blame each other for the team’s downfall. And the best part about this download? It’s free!!! Available on Xbox 360 and PC. ($0.00)
Worst
The Godfather II: Various Packs

You have to hand it to EA: when they release a game, they make sure that there are plenty of downloadable goodies for you to buy along with it. In this case, you can grab a two-pack of maps, some upgraded weapons, and even a powerful henchmen to help you do your dirty deeds. While the maps are a solid deal, the weapons and bodyguard are nearly identical to what can be unlocked in the campaign, making these packs useful only to the fabulously lazy. Available for Xbox 360 and PS3. (Multiple packs with different pricing, $9.99 for all of them)