History YMMV / WhatIf2021

* TheyWastedAGoodPlot: While the Captain Carter episode was well received, some fans wished that both she ''and'' Steve got the serum to have two Captains.

* HilariousInHindsight: In an odd coincidence, the first episode of the show and Film/TheSuicideSquad (which came out within a week of each other in the US) both have scenes where [[spoiler: a mad scientist is killed by a tentacled monstrosity that he brought to Earth.]]

* UnexpectedCharacter: Many fans were taken by surprise by the inclusion[[note]]or at least seeming inclusion[[/note]] of ''ComicBook/MarvelZombies'', or at least [=MCU=] versions of them.

* HilariousInHindsight: In an odd coincidence, the first episode of the show and Film/TheSuicideSquad, which came out within a week of each other in the US, both have scenes where [[spoiler: a mad scientist is killed by a tentacled monstrosity that he brought to Earth.]]

** While the MCU has had a plethora of unique and memorable villains, many people felt that quite a few films wasted those characters by killing them off rather quickly, often in the same films they were introduced in. The trailer for this show emphasizes the return of many fan favorite villains who had minimal appearances in the MCU's past including [[Film/AvengersAgeOfUltron Ultron]], [[Film/BlackPanther2018 Erik Killmonger]], and [[Film/CaptainAmericaTheFirstAvenger Arnim Zola]], allowing them to flourish in animation where they were limited in live action.

* SugarWiki/AwesomeArt: The series boasts CelShaded 3DCG animation courtesy of Squeeze Studios, which is rather stunning and very pleasing to look at. That being said...

** The announcement that some characters in the series will be voiced by different actors has elicited this reaction from some people. While a few of the recastings are justified (particularly with Iron Man and Captain America, due to their actors retiring from the MCU at large), some of them have sparked confusion with the likes of Captain Marvel and Spider-Man, whose live-action actors are still set to reprise their roles in other MCU titles. Although certain fans are understanding and are guessing that the actors are unavailable or have other important projects to focus on. The important project could even be the MCU movies that are coming up.

** Many fans of Peggy Carter were not happy that ''Series/AgentCarter'' was cancelled, and neither were they when her character arc from that series was seemingly undone by Steve Rogers deciding to travel back in time to be with her ''Film/AvengersEndgame'' ([[FlipFlopOfGod depending on which creator involed you ask]]), with some even seeing it as Peggy becoming little more than a prize for Steve to win at the end of the Infinity Saga. This series gives us an alternate timeline where Peggy takes the super soldier serum instead of Steve, thus showcasing her independence and fighting abilities once again without the fear of being overshadowed or deemphasized.

** Many fans of Peggy Carter were not happy how her character arc from ''Series/AgentCarter'' was seemingly undone by Steve Rogers deciding to travel back in time to be with her ''Film/AvengersEndgame'', with some even seeing it as Peggy becoming little more than a prize for Steve to win at the end of the Infinity Saga. This series gives us an alternate timeline where Peggy takes the super soldier serum instead of Steve, thus showcasing her independence and fighting abilities once again without the fear of being overshadowed or deemphasized.

** The official trailer shows Kilmonger rescuing Tony out of seemingly pure altruism, suggesting in this universe he may be a genuinely good man.

** The announcement that some characters in the series will be voiced by different actors has elicited this reaction from some people. While a few of the recastings are justified (particularly with Iron Man and Captain America, due to their actors retiring from the MCU at large), some of them have sparked confusion with the likes of Captain Marvel and Spider-Man, whose live-action actors are still set to reprise their roles in other MCU titles. Although certain fans are understanding and are guessing that the actors are unavailable or have other important projects to focus on.
** One strange example of this is Creator/DaveBautista not returning to the role of Drax in this series, with Bautista himself stating on Twitter that he never was asked to join the series for whatever reason. This confused many fans, [[https://twitter.com/JamesGunn/status/1422301799201968172 including James Gunn himself]].

* CrowningMomentOfHeartwarming:

* WTHCastingAgency: The announcement that some characters in the series will be voiced by different actors has elicited this reaction from some people. While a few of the recastings are justified (particularly with Iron Man and Captain America, due to their actors retiring from the MCU at large), some of them have sparked confusion with the likes of Captain Marvel and Spider-Man, whose live-action actors are still set to reprise their roles in other MCU titles. Although certain fans are understanding and are guessing that the actors are unavailable or have other important projects to focus on.

* SugarWiki/AwesomeArt: The series boasts CelShaded 3DCG animation courtesy of Squeeze Studios, which is rather stunning and very pleasing to look at.
* UncannyValley: Despite the aforementioned SugarWiki/AwesomeArt. Some of the CG models can look this, especially in certain lighting conditions. Thor, in particular, has received a lot of mockery, especially with the close-up of his model in the official trailer.

* WTHCastingAgency: The announcement that some characters in the series will be voiced by different actors has elicited this reaction from some people. While a few of the recastings are justified (particularly with Iron Man and Captain America, due to their actors retiring from the MCU at large), some of them have sparked confusion with the likes of Captain Marvel and Doctor Strange, whose live-action actors are still set to reprise their roles in other MCU titles. Although certain fans are understanding and are guessing that the actors are unavailable or have other important projects to focus on.
** Slightly mitigated with the news that Creator/BenedictCumberbatch [[https://www.reddit.com/r/MarvelStudiosSpoilers/comments/ovkxsu/expanded_what_if_cast_revealed_in_press_brief/?utm_source=share&utm_medium=ios_app&utm_name=iossmf would reprise his role as Strange in some capacity.]]

* AuthorsSavingThrow: While the MCU has had a plethora of unique and memorable villains, many people felt that quite a few films wasted those characters by killing them off rather quickly, often in the same films they were introduced in. The trailer for this show emphasizes the return of many fan favorite villains who had minimal appearances in the MCU's past including [[Film/AvengersAgeOfUltron Ultron]], [[Film/BlackPanther2018 Erik Killmonger]], and [[Film/CaptainAmericaTheFirstAvenger Arnim Zola]], allowing them to flourish in animation where they were limited in live action.

* UncannyValley: Some of the CG models can look this, especially in certain lighting conditions. Thor, in particular, has received a lot of mockery.

* WTHCastingAgency: The announcement that some characters in the series will be voiced by different actors has elicited this reaction from some people. While a few of the recastings are justified (particularly with Iron Man and Captain America, due to their actors retiring from the MCU at large), some of them have sparked confusion with the likes of Captain Marvel and Doctor Strange, whose live-action actors are still set to reprise their roles in other MCU titles.

* UnexpectedCharacter: Many fans were taken by surprise by the inclusion[[note]]or at least seeming inclusion[[/note]] of of ''ComicBook/MarvelZombies'' or at least [=MCU=] versions of them.

* SugarWiki/AwesomeAnimation: The series boasts CelShaded 3DCG animation courtesy of Squeeze Studios, which is rather stunning and very pleasing to look at.

* UnexpectedCharacter: Many fans were taken by surprise by the inclusion[[note]]or at least seeming inclusion[[/note]] of the [=MCU=] versions of ''ComicBook/MarvelZombies''.

* SugarWiki/AwesomeAnimation: The series boasts CelShaded 3DCG animation courtesy of Squeeze Studios, that is rather stunning and very pleasing to look at. It's basically inspired by ''WesternAnimation/SpiderManIntoTheSpiderVerse'', an animated film widely considered to have an amazing art style.

* SugarWiki/AwesomeAnimation: The series boasts CelShaded 3DCG animation courtesy of Squeeze Studios, that is rather stunning and very pleasing to look at. It's basically inspired by ''WesternAnimation/SpiderManIntoTheSpiderVerse'', itself considered to have an amazing art style.

* SugarWiki/AwesomeAnimation: The series boasts CelShaded 3DCG animation courtesy of Squeeze Studios, that is rather stunning and very pleasing to look at.