- Audience-Alienating Premise: The general idea of combining Tekken and Street Fighter in one game raised an immediate eyebrow from fans of both, because it was extremely unlikely that either Capcom or Namco would be able to faithfully combine the two vastly-different mechanics (a 3D fighting game with 8 way movement and a 2D fighter, respectively). This game, naturally, leaned more heavily toward SF mechanics, which meant that ardent fans of Tekken's saw no reason to buy this game outside of brand loyalty. Furthermore, the fact that the SF character models and game engine were obviously recycled from Street Fighter IV meant that people who disliked that game and its engine immediately knew to give this one a pass, and even those who liked it had grown a little fatigued with it by that point (having played the previous 5 editions of said game). And last, but certainly not least, we have Gems, which the developers flat out admitted were introduced as an attempt to bring a Magic: The Gathering style of fun to fighting games. Except tabletop gamers aren't typically fond of the execution ceiling of fighting games, and fighting game players don't particularly like the unpredictability and "pay-to-play" requirements of tabletop games, which left just about everyone confused as to just who this game was for.
- Author's Saving Throw: A number of trans gamers got upset after previews that used an earlier build of the game had transphobic remarks in Ryu and Chun-Li's win quotes against Poison. Following this, Capcom worked with GLAAD to ensure that Poison's depiction in the game was as inoffensive as possible.
- Critical Dissonance: The game was critically acclaimed by mainstream reviewers upon release with 9s and 8s across the board, but fan reception... well, the above section about sums it up. Even after the initial release had passed and there's been plenty of time for fans to cool off, Street Fighter X Tekken is still generally considered the black sheep of the Capcom crossover fighters.
- Designated Hero: Nina teams up with Kazuya because she's a mercenary, and despite knowing how horrible Kazuya's intentions are, business is business. Kazuya and Nina are considered the protagonists of the Tekken side. She does attempt to stop Kazuya in the ending, which makes up for it a bit, but still.
- Designated Villain: Jin serves as the penultimate boss for Street Fighter characters and his counterpart is none other than M. Bison. However, he has a much more noble reason to go after Pandora than both Bison and Kazuya. Not to mention the fact that he has served as the main representative for Tekken in other crossovers.
- Ensemble Dark Horse: King. He was, according to one report, the most played character behind Ryu and Kazuya (surpassing even Ken) during the Captivate 2011 play-testing, and was seemingly popular enough to account for his buddy Marduk as well.
- Poison as well, seeing as how this was the first time she's been in a bona-fide fighting game since Final Fight Revenge, as well as the reaction from fans from her first announcement.
- "Funny Aneurysm" Moment: Dan getting smacked through the door of Ryu's temple by Kazuya in the trailer became one as Dan's been confirmed to have died at Kazuya's hands from said beating.
- Bad Box Art Mega Man was apparently suggested by Inafune himself, but since this Mega Man's unveiling came right off the heels of Inafune leaving Capcom, two cancelled Mega Man games, and Mega Man getting shafted twice in Marvel vs. Capcom 3, this character is still regarded as the cherry on top of the Mega Man controversies (he did make an appearance within MVC3 in the form of a cameo, however).
- Harsher in Hindsight: The use of Rise Against's "From Heads Unworthy" for the final trailer, where Jin finally receives Kazuya's message about Ryu from the first cinematic trailer. The song was released in 2008, and the first lines sound like a summary of the very, very strained relationship between Kazuya and his son:We are the children you reject and disregard.
These aching cries come from the bottom of our hearts.
You can't shoot us down, we are your own flesh and blood.
And we don't disappear just because your eyes are shut.
- Hilarious in Hindsight:
- Daisuke Gori, the voice of Heihachi Mishima, voiced E. Honda in Street Fighter II: The Animated Movie. And now comes this game. If only...
- Hwoarang had a winquote ribbing on Street Fighter in Tekken 5 and 6 ("Don't you have any special moves or something?"). A few years later, here he is.
- This video became funnier once Elena and Christie made it in.
- Playing Arcade with a Tekken character as the lead fighter will result in Akuma as the Final Boss. Several years later, Akuma popped up as a Guest Fighter in Tekken 7 - and as the Final Boss to boot.
- Nightmare Fuel:
- The Pandora's Box stage, more specifically the "2nd round" version. The corpses of Mishima Zaibatsu soldiers flying around and glowing? A Pandora-infused Tyrannosaurus Rex, accompanied with the Pandora-infused wooly mammoth from the "Antarctica" stage? The fact that you're fighting Akuma or Ogre on this stage in arcade mode, and you're probably going to have to use a lot of continues and see this creepy stage again? Oh, sweet Jesus.
- The Antarctica stage. You are facing a pair of Pandora-infused characters while the aforementioned Pandora-infused wooly mammoth is chasing the hovercraft you are fighting inside. To add on top of that, some of the dialogue from the opposing team is downright disturbing, like Xiaoyu willingly giving in to Pandora to help Jin.
- Everything about Pac-Man. His intro makes him sound like an embodiment of Horror Hunger, his confrontation with rival Mega Man has him giving the latter a rather creepy stare, giggling when his ally sacrifices themselves to power Pandora Mode and his ending has him almost mindlessly devouring trees in a city after growing several feet tall!
- Bryan Fury's Super move involves him slamming his opponent into the ground, and then the camera switching to the opponent's POV as Bryan repeatedly stomps their face in. And the whole time, Bryan is maniacally laughing in a way that sounds a little too familiar... it doesn't help that one of Bryan's alternate costumes is, basically, a Monster Clown.
- The Slasher Smile Bison makes in his trailer appearance.
- Overshadowed by Controversy: While the hardcore set didn't really fall in love with the game, it was doing well enough when it first came out... until it was revealed that the coming DLC characters were already on the disk and locked behind a paywall. This didn't endear any potential fans to the game after that and generally one of the reasons why SFxT is shunned by fighting game fans. Capcom had this particular controversy follow them for years afterward, as any talk of DLC for other games would have droves of people asking if those were also on the disc already.
- The Scrappy:
- Rufus. When he was revealed at the 2011 New York Comic Con, he was outright booed by part of the audience. They also booed him because he was confirmed as Zangief's tag partner, which upset a lot of people, particularly the R. Mika camp.
- Bad Box Art Mega Man, due to not being the Mega Man fans wanted (and for appearing at a particularly bad time for Mega Man fans), though some people found him funny.
- So Okay, It's Average: It's not a bad game by any stretch and a good number of critics found it to be fully functional with a very energetic vibe about it that most causal gamers can play. They cite that it's clear Capcom was putting effort into this as indicated by the quirky stages and catchy soundtrack. However, criticism stated that the game is hampered by the gem mechanic which is both cumbersome and out of place in a more down to earth fighting game (i.e: not MvC). This was a sentiment that a lot of the more hardcore set agreed with, and couldn't embrace the gems. Enjoyment of the game mostly rests upon if you don't mind playing what is essentially Street Fighter 4 featuring Tekken characters note
- Song Association: Plenty of examples:
- They Wasted a Perfectly Good Plot:
- The trailers provided more nonsensical stories than the actual game, which suffered from Excuse Plot and Idiot Plot. The Cinematic Trailer 5 is arguably the most complex storyline Capcom has ever made in a crossover; there, we learn that Jin wishes to capture Ryu, who is also being targeted by Jin's father, Kazuya, for an unknown reason. The promotional song appears to focus on the complicated relationship between Jin and Kazuya with the former becoming the target of none other than Bison. Instead, Jin ended fighting the cops in-game.
- Really? They missed out on having Law vs Fei Long?
- Unexpected Character:
- Poison, whose sole playable appearance was in the Final Fight spinoff Final Fight Revenge, and all the Guest Fighter characters in the Playstation versions.
- Cole McGrath making it in as a Guest Fighter, as he's not in either Capcom or Namco's side.
- Toro is barely known outside Japan, despite being created in 1999 and being Sony's mascot in that country, he had only a few games made for himself since then; Toro basically grew to be a real mascot rather than an actual video game character, and his being actually playable instead of just a cameo is quite surprising. Kuro was even more unexpected due not being a heavy advertised mascot as Toro, he doesn't even get the cameo treatment, he is purely a Doko Demo Issho character.