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.
YMMV: Digimon Adventure 02
Alternate Character Interpretation: Mainly involving Kari's relationship with Davis, and whether or not she's innocently clueless, trying to make him jealous, or just can't decide between him and TK, or trying to ship both of them together.
The Artifact: The original eight Digidestined become this. Yes, even Kari and TK, who might as well not have been in the final two episodes for all that they accomplish.
Badass Decay: Poor Angemon and MagnaAngemon. In the first season Angemon was on par with the Ultimates despite only being a Champion and MagnaAngemon, a ultimate level Digimon, was able to single-handedly take down a powerful Mega Digimon. Next season, all further appearances of Patamon's normal evolutionary line don't show him being nearly as impressive as he was in season 1. Partially justified: Angemon and MagnaAngemon are just super effective again evil Digimon but not against artificial digimon.
Big Lipped Alligator Moment: The episodes involving: The Dark Ocean,The Daemon Corps,and Veemon's Digivolution to Ex Veemon,and Hurricane Touchdown
Complete Monster: Upon returning as Malomyotismon, the Digidestined's old foe proves to be every bit as evil as before. Arguably, he's gotten even worse - Myotismon used to kill minions for failing him. As MaloMyotismon, his first act is to brutally kill Arukenimon and Mummymon purely For the Evulz.
Sequelitis: The general concensous is that as a sequel to Digimon Adventure, this didn't work out as well, which may be why the Adventure continuity was scrapped in favor of new ones each series afterwards.
Davis Took a Level in Badass in the final two episodes, and after spending pretty much half the season being the Butt Monkey of the group that no one really agreed with and the only one who always got hate from everyone else, his moment to shine was indeed awesome.
Angemon and Angewomon achieving there mega levels in the third movie. Even if it was never explained.
Die for Our Ship: And the intense ship wars continue on to this day. If you didn't ship Yolie with Ken, you were expected to hate her. Even worse when she did get him.
Fan-Disliked Explanation: The explanation for why the original children did not have there crest powers was disliked so much that they retconed it in-show.
Family Unfriendly Aesop: Davis' problem early in the season was that he was hesitant to take action — for example, not wanting to attack Agumon, who had been kidnapped and brainwashed by the Digimon Emperor, despite there being no other way to remove the Dark Spiral. There's also the episode where Ken "kidnaps" all of Davis's friends and then forces Davis to pick between them. Davis is completely unable to react in this situation, and is on the verge of offering himself in their place. Ken is untrustworthy.
Another possible example is when Cody refuses to take the digiegg of Reliability since he told a lie, and Joe give him an inspiring speech about how, while some lies are hurtful, there are some lies which are not only acceptable, but helpful. This one pulled him out of a possibly important exam because Cody was telling him that his dad was in the hospital. Even if it was a life and death matter, there was little thought put into keeping up The Masquerade.
Seasonal Rot: Apart from the bucket of Fan Disservice that was the Distant Finale, the series seemed to change plots as often as someone changes clothes. This is especially poignant in the small (yet important) Holy Stones arc. These world-shattering sacred rocks were never mentioned until Mummymon casually talked about it in a 10-second conversation. There was little foreshadowing, and once they were all eliminated they never came up again. Additionally, most revelations about The Man Behind the Man seemed to come out of nowhere, and Chiaki Konaka's Cthulhutastic guest-writing episode - originally intended to set up another subplot - went completely unexplained, was almost never referred to again, and comes off as a Big Lipped Alligator Moment. It generally reeks of a series where they had plenty of ideas, but perhaps had too many and were very careless and haphazard about how they applied them.
Ironically, many people cite the exact start of the series' second half, episode 26 (with the introduction of DNA Digivolving) as the point where the plot really started to get convoluted.
Squick: In the original version, the King of the Dark Ocean's minions weren't trying to get Kari to destroy their Evil Overlord. They were trying to bring Kari to him so that he could matewith her.
Strawman Has a Point: Davis tries to convince the team that Kens has changed and have him on the team. While the other kids do feel that he has changed, they felt that it was too soon to trust the person that they have been fighting for months on end.
Strangled by the Red String: Sora and Matt, them ending up together was surprising even for their Japanese voice actors.
Ken and Yolei for some, seeing as only one side of the relationship ever showed any attraction to the other.
Too Many Cooks Spoil The Soup: A very likely explanation to this installment's plot and characterization problems; the series had two story supervisors (most other Digimon series have one), seven scenario developers, all with a team of scriptwriters under them.
The Woobie: Ken, of course, Wormmon, and Wallace from the movie.
Datirimon, Oikawa's partner Digimon. It waited many years for Oikawa to show up, only for Oikawa to die in front of him after they just met.
Jerkass Woobie: Oikawa. He's a creepy bastard, but his life story is so damn SAD.
Iron Woobie: Ken, for his persistence in knocking down Dark Towers, even while fully expecting the rest of the team to continue hating him, and his concern for the Dark Seed kids, who followed Oikawa of their own volition.