Undead Nightmare received "generally favorable" reviews, according to
review aggregator website
Metacritic, and was named among the best downloadable content of the year. It won the award for best downloadable content of the year at the 2010
Spike Video Game Awards, and at
Shacknews over other notable packs like
Lair of the Shadow Broker (
Mass Effect 2 and ''
Minerva's Den (BioShock 2. IGN''s Kristine Steimer awarded the title a perfect score as a "masterpiece" and editor's choice, while
GameSpots Justin Calvert wrote that, while fun, the game was not as much a masterpiece as the original. Dan Whitehead from
Eurogamer credited
Undead Nightmare nuanced treatment of John Marston as proof of him being "one of gaming's great characters". As a continuation, "
Red Dead Redemption elegiac tone knits incredibly well with [its expansion's] arch Gothic horror", wrote Whitehead. Critics found the expansion's story to be much more lighthearted in comparison to the main game, with a different overall feel. Steimer (
IGN marked the title's exaggerated theatricality and overtones of horror
B movie panache. At the time, zombies were a recurring motif in video games. Whitehead added that Rockstar's ability to use the "most played-out and over-exposed cultural meme" in their "epic Western" without the product appearing silly or gimmicky was a testament to their design acumen. For instance, a talk with Sasquatch was both absurd and poignant. The expansion's script, he wrote, understood the spirit of its characters and balanced sardonicism and honest pathos. While Whitehead liked the treatment of the main character, he considered the expansion's mission design lackluster and complained of too many quests in which the player fetches items for other people and traveling between points only to initiate cutscenes. Calvert (
GameSpot praised the story's humor but felt that it was less interesting and varied compared to the main game. Reviewers recommended finishing the base game before starting the downloadable content, not for spoilers but to make the most of the game's references to the original story. Reviewers noted the amount of work Rockstar put into the expansion's production. Calvert (
GameSpot said that the expansion added significantly new features and kept the main game's best qualities in its presentation. Whitehead (
Eurogamer wrote that Rockstar's effort appeared to challenge their constraints while other developers often aim for the bare minimum. The reviewer compared the game's reinvigoration to that of the download content created for Rockstar's
Grand Theft Auto IV. He also appreciated the continuity of the "apocalyptic" and melancholic ambience in which the base game considered the metaphorical extinction of the cowboy west while the expansion considered the literal extinction of civilization. Critics noted ways in which
Undead Nightmare borrowed zombie designs from the
Left 4 Dead series. This disappointed
Eurogamer reviewer in consideration of Rockstar's reputation as a pioneer rather than an imitator.
GameSpot highlights from the game included its multiplayer, imaginative weaponry, mythical mounts, and eerie soundtrack. Critics reported that players rarely need to use
Undead Nightmare new weapons. Whitehead (
Eurogamer said that Marston's firearms are mostly indistinguishable apart from the blunderbuss, which is only useful when the player is overrun by zombies. Calvert (
GameSpot added that the game's combat is repetitive and less fun in the expansion, as zombies barely pose a threat; without guns, cover, and horses, they lack the complexities of cowboys and, apart from some special zombie types, are only a threat at short distances. The reviewer found little variation between weapons when firing at close range, which is more effective than aiming at a distance. The fun of the new guns quickly faded for Calvert, who found little incentive to use traditional gunfight strategies. Whitehead (
Eurogamer too noted that the base game relied on its use of cover during gunfights, which the expansion jettisons altogether. Thus the player is forced into the technique of backtracking and turning to use the time-slowing Dead Eye mode to clear zombies with headshots. The reviewer also found the controls clumsy and often tripped on piles of zombie bodies or became stuck in doorways. While the idea of zombie animals scared Whitehead, he was both relieved and disappointed to find that bears and cougars, like the humans, died with a single bullet.
Eurogamer noted the annoyance of returning to defend over 20 towns each with recurring zombie problems, but said that the game mechanic is never too bothersome and even appreciated its element of time management, similar to that of the
Dead Rising game series.
IGN thought that the lack of fast travel was an impediment. Reviewers also noted technical issues with moving John's character, especially when climbing ladders and outrunning zombies. Critics praised
Undead Nightmare as a model for downloadable content especially in its balance of content and price. Neil Davey (
The Guardian said it was the best purchase of 2010 at its price range, but
Official Xbox Magazine found the price slightly too high. Henry Gilbert of
GamesRadar thought the game's concept sounded like a ploy to make easy money without much work, but admitted how wrong and surprised he was at the game's depth. In 2010, the
Official Xbox Magazine counted
Undead Nightmare among the best downloadable content in existence. The standalone retail disc had sold two million units as of August 2011. No sales figures were released regarding the download pack itself.
Red Dead Redemptions PlayStation 4, Nintendo Switch, and Windows versions were praised for the inclusion of
Undead Nightmare, though some critics lamented the price due to lack of significant enhancements and omission of multiplayer. == Legacy ==