Alternative Character Interpretation: Morland Holmes seems deliberately written to invite this, as his motives and sincerity are always put into question and even to the very end viewers are left guessing about just how good or bad he is.
Anti-Climax Boss: Moriarty. After being built for half a season, her capture in the Season One Finale was this for some. Worth noting, however, the original "Napoleon of crime" only appeared in one Doyle-written story (and died at the end of it), so it's actually more faithful to the original work to have Moriarty ultimately be a relatively minor Arc Villain instead of the series' Big Bad, although this version remains an occasionally Recurring Character.
Ass Pull: In "The Marchioness", the revelation that Joan slept with Mycroft during the events of "Step Nine" makes absolutely no sense within the narrative and pissed off the majority of the fanbase.
Award Snub: In six seasons, the show has yet to win a single Emmy award and its only nominations were for the main title and credits, not the writing, acting or directing.
Badass Decay: Sherlock spends the first season getting excellent character development and humanization thanks to his improving friendships while also speeding through cases. He spends the second season arguing with Joan, getting upset and anxious over the thought of Joan leaving him, getting jealous about Joan's relationship with Mycroft, and possibly turning back to drugs once Joan moves out. Thankfully, he rebounds in the third season after some time apart from Joan.
In the second season, Mycroft. Some fans found him to be a strong character and loyal to the canon, while others found his plotline tedious and overlong and his relationship with Joan a complete Ass Pull.
Was the second season finale brilliant or awful? Was the second season in general as good as its predecessor or an uneven, heavily flawed season? Most fans seem to lean towards the latter, especially with the implication that Mycroft pulled a Reichenbach fall and not Sherlock by faking his death to save the day, despite RF being a pivotal point in Sherlock's character. Not to mention that Joan's making plans to move out of the brownstone, stating that she needed to grow away from Sherlock despite essentially one-upping him all season. And then Sherlock is seen with drugs he'd stolen from an earlier episode, contemplating using again!.
Season 3. A return to form? A mild improvement after season 2? The show fully Jumping the Shark? Seems everyone has a different opinion.
Adelbert "Del" Gruner, from season 3's "The Illustrious Client" and "The One Who Got Away", uses his corporate executive status and charming facade to attract many women, before kidnapping them, and torturing them with his branding iron, while also raping them. This kind of brutality would last for weeks before his victims would succumb to their wounds, while Gruner would find more women, having doing this for years racking a body count in the dozens; Kitty Winters was the only survivor of Gruner's cruelty.. When Gruner learns that Kitty is trying to bring him to justice, he tries to incriminate her, while continuing his killing spree in New York.
Tyus Wilcox is introduced in season 5's "Scrambled" as the seemingly-innocent brother of Bonzi Folsom, the leader of the South Bronx Killers gang. He is later revealed to be secretly running the gang, and has Folsom killed with bleach laced cocaine when Folsom receives too much police scrutiny. In the next episode, "Hurt Me, Hurt You", Wilcox kidnaps Carmen, the innocent sister of Mara Tres gang leader Halcon, forces her to read out a message on camera, kills her, and sends her body along with a recording of the video to her brother. Halcon, in retaliation, has a SBK party massacred, killing ten people including two children. Wilcox, knowing that the police would want to prevent the war, sells out his entire gang to receive a full immunity deal. Wilcox then calls Joan Watson, mocking her over the death of gang informant Shinwell Johnson, and scoffing at the idea of being loyal to his gang.
Alfredo and Bell have their fair share of admirers.
Clyde the tortoise is also rather popular as well.
There's also clamoring for seeing more of another character: the crusty snow-plow driver, Pam.
Despite only appearing in a few episodes, Ms Hudson is extremely popular among fans due to being a very positive and respectful portrayal of a transgender character in a mainstream show and one who is played by a transgender actress as well. Her appearances are always well-received.
Fandom Rivalry: Fights with some factions of the Sherlock fandom have gotten nasty. It's reached national newspapers. The stupidity of the rivalry has reached astronomical bounds, especially since some die-hard fans of Sherlock insult Jonny Lee Miller's performance as if they're paying a service to Benedict Cumberbatch by doing so... seemingly not understanding that the two are good friends and performed in a play together. Tensions have calmed only at the second series, where even antagonistic fans admit that Elementary isn't that bad. They've also calmed after the divisive fourth season of BBC's Sherlock turned many fans against the show.
Between Moriarty and Joan, especially during the restaurant scene. Also, the traditional Holmes-Moriarty Foe Yay is given a new dimension by having Moriarty be a woman and having her and Holmes actually having been lovers once. Later on, we learn that Moriarty now considers Joan a Worthy Opponent, just like she does with Holmes.
In "The Female of the Species," Moriarty arranges for the murder of a criminal who was targeting Watson because as far as she's concerned, Holmes and Watson belong to her and her alone.
"Miss Taken" ends with the unnamed conwoman taunt-flirting with Holmes and saying she hopes he'll be at her trial. She also seems quite visibly pleased to see him visit her in her cell.
Seems to be striking up a relationship with Sleepy Hollow, as they both have female characters of color who take no shit. It also helps that the Twitter pages for both shows' writers have been engaging in a hilarious Twitter "feud", with the CSI writers piping in.
"Solve For X" revolves around "P versus NP," the most notorious unsolved problem in theoretical computer science.
In "An Unnatural Arrangement," we meet a character with the unfortunate name of "James Monroe," and British Sherlock Holmes quips "Loved your doctrine." Britain was one of the only European nations to actually be in favor of the Monroe Doctrine.
In "Meet Your Maker", the incels of the Elementary-verse are apparently so dangerous, so harmful, that Sherlock speaks of them with the same disdain he'd use to speak of white supremacists, terrorists, white supremacist terrorists, or his dad. They've also been banned by every major web hostnote This isn't even true of white supremacists on the show., forced onto the Darkweb, and have Homeland Security looking to question/arrest the guy that hosts the largest site, but in real life they've lost...a subReddit. And one website.
The idea that Moriarty faked an American accent as Irene well enough to fool Sherlock falls a little flat when Natalie Dormer's accent slips through plenty of times in "The Woman" to the point where casual viewers can pick up on the fact that it's a faked accent.
In "Paint it Black", Sherlock deduces that a suspect is using the chat function in an online video game for secret conversations. He comes to this conclusion because the suspect logged 50 hours "without earning a single point". Leaving aside that logging 50 hours on an MMO is barely unusual, video games haven't bothered with points in years. In all fairness, Sherlock could easily be talking about experience points, which are a staple of online games, and just using a simplified explanation for the benefit of Mycroft (and perhaps the audience), who might not be so familiar with the terms. Not to mention the fact that online leaderboards have created a resurgence in the use of points in videogames in the last few years. And, in that context, the 50 hours is more remarkable in that most anyone who'd spent even that unremarkable period of time with an MMO would have at least done something - nobody plays an MMO for fifty hours without even leaving the tutorial area.
The pilot has Dallas Roberts play the role of the psychiatrist who manipulated the killer of the episode into murder. Roberts played recurring characters in The L Word, Rubicon and The Good Wife prior to this role. For many viewers watching the show after the initial airings, Roberts was obvious as part of the conspiracy because his next role after filming the pilot was a very important role as Milton Marnet in The Walking Dead.
In "Lesser Evils", the seemingly tiny role of the janitor was played by David Costabile, aka the Big Bad on Suits aka Gale Boetticher, a major role in Breaking Bad. A character who turns out to be an additional killer also falls under this, as he's played by David Harbour, of The Newsroom.
In "The Long Fuse", Lisa Edelstein (Dr. Cuddy on House) plays a business executive who turns out to be the bomber.
"Deja Vu All Over Again": Subverted. The show features Jim True-Frost and Andre Royo, both of whom will be very familiar to viewers of The Wire. Neither one did it.
"Snow Angels": We see the female murderer at the beginning, and she is shot by her victim right before he dies, but don't get a very good look at her because of a disguise. Later in the episode, we meet a girl played by Jill Flint of Royal Pains, who claims to be a stab victim, but who Bell takes in as a suspect. And yes, she did it.
"Blood Is Thicker": The wife of Gale the internet billionaire is the killer. She is played by Margaret Colin who recently finished a 5 year stint as Eleanor Waldorf on Gossip Girl.
"No Lack of Void" features Garret Dillahunt (AKA Cromartie and Burt) as the killer of the episode.
The killer in "Dead Man's Tale" was Patrick Fabian, who was a deep-sea salvage expert who was trying to pull off a The Producers style plot where he needed to fail rather than succeed. Fabian has had major roles on shows like Gossip Girl and more recently, Better Call Saul.
Paranoia Fuel: The idea that your beloved significant other is not only a career criminal, but a career criminal that is hellbent on destroying you. So much so that they invented a whole persona for you to fall in love with, just so they could get close to you.
Periphery Demographic: In addition to Holmes fans and fans of the police procedural, Elementary has gained an enthusiastic following from progressives, especially feminists, not just for Gender Flipping Watson and Moriarty, but also for subtle signs scattered throughout the series that the show's makers are earnestly trying to make the show progressive and pro-feminist. Judging by the enthusiastic response, they've largely succeeded. It's also praised for being one of the few shows with an Asian lead character.
The Producer Thinks of Everything: The show's first season was acclaimed by the fandom due to the several continuity nods (from the "Pilot" to "Heroine", the season finale), consistent Call Backs, details scattered around the episodes, good Foreshadowing, a significant soundtrack, and a solid story arc which developed in a right pace.
Ship Sinking: The Kitty/Sherlock ship goes down in flames when she returns to New York in a two-parter and is revealed to have a child, among other changes in her life.
Sophomore Slump: The second season was as enjoyable the first as far as episodic plots are involved, but was marred by Conflict Ball-induced stupidity, Sherlock and Joan bickering rather than getting closer like fans wanted, and Mycroft's drawn-out plotline, and a somewhat unbelievable romantic subplot with Joan. Season 3, thanks to Kitty's terrific character arc and a saner dynamic between Joan and Sherlock, was a return to form.
Abigail Spencer takes the cake for having one of the most tragic stories in the entire series. Her backstory with Sherlock also makes you feel bad for the kind of childhood they both had.
And then there's Kitty Winter, who was held hostage by a serial rapist/killer, an experience that left her physically and emotionally scarred. Thanks to the friendship of Holmes and (eventually) Watson, she not only starts to heal, but finds the man who victimized her... and decides not to kill him (although she gets her revenge in a rather horrific way).
Sherlock is one himself, with his past, and his constant struggle with addiction. He's technically a victim of, at least, emotional abuse from Moriarty. And he's got some pretty potent puppy dog eyes.