These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Broken Base: Fans are divided over Kiefer Sutherland replacing David Hayter as the English voice of Big Boss. This was made worse after the announcement that David Hayter would apparently not reprise his role as Solid Snake for the Deja Vu DLC mission.
The media reaction to the Ground Zeroes demo caused a far greater breakdown, with its massive changes to the formula, such as adding lens flare, slow-motion takedowns, more action focused gameplay, tagging and more of an emphasis on regenerating health. To be fair, regenerating health has been part of the series since Metal Gear Solid 3 (though it was dependent on stamina).
Epileptic Trees: The New Coke◊ theory. Hideo Kojima cast Sutherland as Snake. After a series of rather teasing tweets* "I just hope I don't lose my voice"; "I think I feel laryngitis coming on...", Snake's previous voice actor David Hayter compares Sutherland to New Coke via Twitter. There has been a long-standing theory that the 1985 New Coke was a ruse to spur sales of Coke Classic. * Officially denied by the Coca-Cola Company but acknowledged as a worthy strategy if they had ever been clever or risky enough to think it up in the first place. Therefore, Sutherland is New Coke, Hayter is Coke Classic, Kojima is using this to create buzz for the game and all three are in cahoots.
Harsher in Hindsight: In Metal Gear 2: Solid Snake, Miller describes Big Boss as being a monster.note In context, he was really talking about his superhuman strength. One of the trailers shows him administrating the torture of Huey, with Big Boss nowhere to be found, a sign that his actions at the time were Not So Different.
Hilarious in Hindsight: This bit of fanart from 2008 featured Solid Snake going up against Jack Bauer. Flash forward to present day when we learn who's going to be the new voice actor for Big Boss...
Even more hilarious is the achievement/trophy you can get in Metal Gear Solid 3 HD for interrogating someone in CQC. The name of it? "Tell me where the bomb is".
Internet Backdraft: The English Ground Zeroes trailer was received with this. Complaints were mainly targeted at Sutherland's bored voice (further adding to the Hayter controversy) and Skull Face sounding like someone trying too hard to sound cool.
The fact that both DLC campaigns (Deja Vu and Jamais Vu) are console-exclusive missions for separate consoles hasn't exactly sat well with a number of people.
Kojima mentioned on a podcast that he wanted the horses in the game to periodically defecate. Yeah.
Unfortunate Implications: There has been a slight media backlash to Kojima's intentions for Quiet in the game, which he initially stated that he had told Yoji Shinkawa to design as a "more erotic" character, which wasn't helped when he tried to correct it as him meaning "sexier" partially due to wanting to increase merchandise sales surrounding the game. Ironically, one of the people who was offended by the character's appearance helped design Cortana, a Stripperiffic character.
Visual Effects of Awesome: The FOX Engine is perhaps one of the most advanced development platforms available to date, being composed of several novel state-of-the-art software tools and compatible with highly sensitive 3D scanning equipment. The primary aim of FOX is to achieve photorealistic visuals, and it comes damn close at times. And this can still run on seventh generation console hardware, in addition to eighth generation hardware.