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.
Is Sora a Well-Intentioned Extremist who honestly wants to make the world a better place, and who will do whatever he must and who will sacrifice whatever he must to do so, or is he a power-hungry bastard who couldn't care less about all the pain and death he leaves in his wake as he attempts to rule the world?
Angst? What Angst?: Konomi cheerfully tells Ringo that she was so poor at one point that she was living off of the food that a supermarket threw away.
Arc Fatigue: Averted for the most part, unlike many other fighting series. In Air Gear, the action is typically well paced and the story doesn't drag out longer than it should.
Awesome Art: Some fans love how the story changed at around the half-way point. Other fans hate it. A small minority just think that the entire story is a mess. All of them agree that Oh!Great's artwork is one of, if not the the best point of the manga. The character designs started off weak and somewhat inconsistent, but they were cleared up by the tenth volume, and the backgrounds and technology in the series are always drawn superbly.
Better on DVD: The series has less censoring on DVD than it did when it aired on TV. It's also easier to read in volume format, with more than eight chapters at a time, than it is to read it one chapter a week at a time.
Broken Base: Fans tend to either like the new direction Air Gear took, what with the introduction of Genesis and The Sky Regalia, thinking that it is a good blend of the old feel of the manga and new material, or hate it because the series became too complex and completely lost the old feel of the earlier chapters. There are very few who stand in the middle.
Canon Fodder: The question of what exactly is Ikki; whether he's actually a normal human or Dr. Minami's masterpiece — greater than both the Gravity Children and the Brain Chargers — is left unanswered and several fans have picked up on that.
Cliché Storm: A criticism often leveled at this series, and the main conflict of the series and the driving motivations of most of the characters are a bit contrived. However, Oh!Great likes to expand on many of these clichés (not necessarily subverting or deconstructing them) and explore them. This can be seen in the extremely well developed main cast (many of whom began as typically clichéd shonen characters before evolving) who all have hidden depths that are often surprising.
Complete Monster: Sora is an absolute bastard who emotionally abused his brother and his girlfriend, the two people who loved him and trusted him most. He even brainwashed the latter, and when they stopped being useful to him, he threw them aside like trash. While he does have a slightly sympathetic past that paints him as a failure, this justification rings hollow when it's shown that he's orders of magnitude more powerful than every single rider except Ikki. Furthermore, he remorselessly killed several friends who were once in the same situation as him and who even helped him, all in the name of gaining personal power. He is either directly or indirectly responsible for all of the deaths in the series and he doesn't even think highly enough of the lives he's taken to feel something like satisfaction, let alone remorse or regret. After he is defeated, he spits in the face of redemption and even tries to turn his girlfriend into a bomb so that he could kill everyone in the tower in which he was fighting so that even if he were to lose, his opponents wouldn't win, and he only gave up afterwards when faced with overwhelming power that convinced him he would never be able to succeed. Even his terrifyingly Ax-Crazy brother looks tame and compassionate in comparison.
Magaki of the Skull'Saders. He's a vicious bastard and a confirmed rapist who enjoys raping high school students.
Agito/any male fans tend to really detest Yayoi. When they started getting Ship Tease, it apparently got so bad that bitchy fans made online petitions to pressure Oh!Great into splitting them up.
Many Ikki/Kururu fans have always vehemently despised Ringo, to the protest of many people, even other Kururu/Ikki shippers who think the haters are out of line, and after Ikki and Ringo got together, many of these haters began calling for Ringo's death in the final battle.
Fan-Preferred Couple: Until Ikki chose Ringo, Kururu was the most popular of his love interests. Even many IkkixRingo shippers admitted that despite their hopes, Ikki would probably end up with her anyway.
However, after several scenes showing just how close Ikki and Ringo are, and of course after their Relationship Upgrade, many fans are actually supporting that couple, and although the Ikki/Kururu ship still has its supporters, the Ikki/Ringo ship now seems to be the largest.
Guilty Pleasure: The manga itself. Forum threads about the series are full of posts written by people protected by the anonymity of the internet talking about how stereotypical, even contrived, the series is, yet almost all of them still have nothing but love for it because a) the art is fantastic, and b) the series is just a lot of fun to read.
I Knew It: Here's a shipping example: A small number of fans pointed out that there have always been hints that Ikki and Ringo would end up together even in the face of most fans (even IkkixRingo and IkkixSimca shippers) figuring that Kururu was the most likely of the three love interests to win. These shippers brought up a number of scenes that show just how close the bond between Ikki and Ringo is. Come Chapter 329, a good number of those scenes are actually shown in passing, meaning Oh!Great was building up their relationship from the start and that these fans were right.
Moral Event Horizon: Sora and Nike tend to step over this line from time to time. Examples include Nike killing gravity children he was training because they could not keep up with his training, and Sora trying to kill himself, Ikki, Ringo, and Rika, the woman who loves him and is pregnant with his child. To reiterate, he tried to kill the woman he loved just because he was a Sore Loser. Not even Nike would stoop that far.
MST3K Mantra: While the story, if you think about it, makes some kind of sense, the powers that people use are based on pseudophysics at best and if you try to apply real-world physics to them, you'll fail miserably, so just sit back and enjoy it without thinking too much about the science behind the series. And of course, just run with it when the weird shit (like a Humongous Mecha) keeps piling up. You'll enjoy it, trust us.
Narm Charm: However, this just make him more entertaining, and it's likely done on purpose.
Reread Bonus: The story will make much more sense if you read it again after you're done the first time. You'll notice some instances of Foreshadowing and find the twists that seemed to come out of nowhere are actually hinted at at least several times, sometimes more than 100 chapters before they happen.
The biggest example? Foreshadowing the 1%/99% divide in Chapter 17, 9 YEARS before Occupy Wall Street that the series was accused of ripping off.
The Scrappy: A lot of fans hate Simca, especially IkkixRingo and IkkixKururu shippers. While some of this is just what you usually see in a Shipping War, many dislike her because she manipulated Ikki by using her attractive body and his feelings for her in order to get him to do what she wants him to in a sort of All Take and No Give relationship. Then there's the fact that for a while, she only cared about Ikki for his potential, not because she actually liked him, and although he may have grown on her as the story went on, many fans don't like this aspect of her character.
Ship-to-Ship Combat: IkkixKururu vs. IkkixRingo, with the (much smaller) IkkixSimca getting some shots in as well. This combat is a bit more one-sided than most, with relatively few Ringo fans actively bashing the girls supported by other shippers, but a great deal of Kururu and Simca shippers take potshots at Ringo. Especially after Ikki and Ringo became the Official Couple. At that moment, IkkixKururu fans went rabid. However, there has always been a significant portion of the IkkixKururu fanbase that is quite civil and is rather disgusted by other shippers' behaviour.
Squick: God damn, more than half the things Onigiri says or does. There are some other examples, such as Arthur and Shalott.