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.
Base Breaker: The series is extremely popular, but there are some fans who believe that Capcom is outright shilling this series to death, for severalreasons. It certainly doesn't help that they've basically shoved Street Fighter intoseveraltitles already (Street Fighter X All Capcom being an example of this taken way too far) and announced Ultra Street Fighter IV, yet another add-on to the Street Fighter IV games.
Ryu, is he an exceptional example of the Warrior spirit who is one of the finest examples of how a Blood Knight can be a genuinely good person? Or is he a flat out generic "karate man" who is a blatant case of Designated Protagonist Syndrome who doesn't have a life outside of fighting? The former often like to point out his Character Development in the Alpha series. While the latter often point that aside from the first game Ryu is very much a Supporting Protagonist in the main series.
Though the fact that the series is a known case of Capcom Sequel Stagnation ever since Street Fighter II. Many have mocked Capcom for doing this over the years on how the series has more reversions than actual sequels. Though some try to defend the reversions by how at least Capcom is being a lot more honest about them (and think that most fighting game sequels are usually reversions anyways).
Despite not much being known about him (due to the characters in the SFIII series not having concretely-outlined back-stories, Urien is implied to be one as well. In Third Strike, he kidnapped one of Chun-Li's adopted kids for use in experiments (presumably the same kind that created Necro and Twelve, or something similar), which was only prevented because Chun-Li went Mama Bear on him. And while his brother Gill is touted as a Well-Intentioned Extremist despite being the Big Bad, Urien's personality is hinted to be considerably worse.
Bison. He's ripped out the good from his own soul, for starters. In several win quotes and UDON comics, he's expressed Dystopia Justifies the Means views, brainwashed women into serving as assassins and who knows what else, constantly taunts people about loved ones he's killed and seems to have few, if any standards.
Fan Myopia: Fans have complained about whenever Street Fighter adaptations use Guile as The Hero when M. Bison is the Big Bad instead of Ryu even though Guile is well known as Bison's main arch-nemesis.
Fanon: It's a general consensus in the Fandom that Ken beat Ryu when they met during the events of II. Ken promised not to marry Eliza until he defeated Ryu in a fair fight (during their match in Alpha 2, Ryu was preoccupied with other matters, namely the aftermath of his fights with Sagat and Akuma) and by the time of IV (one year later), Eliza is expecting a child and actually gives birth to Mel in SSFIV; Mel appears as a child in III.
Chun-Li's father is usually referred to as Dorai, which was the name given to him in II V. His Canon Name, if Capcom has even bothered to give him one, has yet to be disclosed. Similarly, she is usually given a surname of Xiang/Zhang (originating from the live-action movie, where all of the characters were given first and last names). It might actually be Chung, but this piece of info reportedly came from a source in the early '90s and was probably forgotten or kicked out of canon by Capcom. Recent games don't bother giving Chun-Li a full name.
And from the first live-action movie and American cartoon, several, such as Ryu's last name (Hoshi), Sagat's first name (Victor), Guile's full name and rank (Colonel William F. Guile), and since he was called Dr. Dhalsim in the movie, Dhalsim would be his last name.
Juri/Cody and Juri/Adon, as far as hetero Juri pairings go.
Foe Yay: Vega has a one-sided case with Chun-Li. She's a cop who's only concerned with arresting him by any means necessary, but Vega shows concern for Chun-Li for the same reasons listed in the Pet the Dog entry below. As long as she is alive and oh so beautiful, he looks forward to the next time when they may cross paths.
Ensemble Darkhorse: Retsu. Despite having appeared only in the original game, he's much more loved by the fanbase than other characters who suffered the same fate, and he has been used prominently in several related media.
Awesome Music: Not many people know that the 90's Street Fighter movie had it's own soundtrack, a collection of soundtrack-exclusive hip-hop songs from some of the biggest and best at the time. A video was even produced for the MC Hammer song "Straight To My Feet," whose video prominently features Van Damme as Guile.
Cliché Storm: A few of the most prominent action movie cliches show up.
Rooting for the Empire: On the one hand, you have a corny and bland one by Jean-Claude Van Damme as the boring, traditional hero. On the other, you have the magnificently absurd and entertaining performance by Raul Julia, a great actor who tragically died in his prime shortly after completing the film.
Spiritual Licensee: Heroic army lead by a handsome blond American takes on a crazy megalomaniac who wants to take over the world and his shiny-domed weapons supplier. Are we sure this wasn't originally a script for an unmade G.I. Joe film?
Took The Bad Film Seriously: Watch the "Making Of" featurette on the DVD. The actors seem well aware of the ridiculousness of the movie they are making. However, director Stephen de Souza seems to be under the impression that he's making the next Die Hard/Lethal Weapon.
Exactly whose idea was it to cast a 52-year-old classically-trained theater actor with absolutely zero martial arts background in an action movie based on a video game? Raul Julia's kids', that's who. However, as it turns out, he's by far the most memorable character of the movie for his Large Ham performance, so it all turned out good.
Far worse has got to be Jean-Claude Van Damme, with his unshakable Belgian accent, as a character so American he's got the American flag tattooed on both shoulders.
In the games, Cammy is a muscular Amazon with an American or Japanese accent. So, this role obviously goes to tiny Australian pop princess Kylie Minogue.
The American series
Base Breaker: There are plenty whom deem this show to be another laughably horrid adaptation of the series much like the 1994 movie. But the show does have its fans especially on how it was at least a lot more game accurate than the movie ever was. (For starters aside from Zangief everyone is at their proper alignments now compared to the movie.) The fact that the series became a bit more game accurate over the course of the second season did help.
Blanka being the mutated form of Charlie. Many decry it for being a wildly inaccurate subplot on how in the games Blanka and Charlie are completely different characters and that Shadaloo has nothing to do with Blanka. But some actually liked the idea behind this subplot as it gives Blanka a sense of actual importance in the storyline. (That and on how it seems cooler than being Dan Hibiki's sidekick.)
Fountain of Memes: "This.is.delicious!", "Bison!", "Naaaooooo!", "Yesh! YESH!", "No! Not the head-bite!"
Growing the Beard: The second season has several character arcs through its episodes (i.e. Blanka's accidental further mutation, a growing rivalry between Ken and Ryu, Cammy's brainwashing, and Bison's acquisition of an ancient healing statue that, over the course of the season, drives him to world-destroying insanity). All this and Final Fight, too!
In "The Warrior King," Bison gains control of an orb that can create all sorts of weather and nature phenomenon and holds the world for ransom with it; one of his demonstrations of power is to create a flood in Tokyo, Japan. Fourteen years later...
Wangst: Blanka is sometimes criticized as being incredibly whiny about the whole "Mutation" thing. In fairness, he was unwillingly mutated, but literally every single appearance that centered around him had him angsting in some way or another, despite common sense dictating that he get over it.
Hilarious in Hindsight: There's one story in the New Generation GN where E. Honda and Hakan argue before the Olympic Wrestling Committee to have their respective sports represented in the games. They're outraged when they're told the next available spot for both sports would be in the 2032 games. The IOC dropped wrestling from the Olympics (starting in 2020) about two weeks after the GN came out.