I can understand the Dark Ocean thing. In a way, it's the whole Dark is the opposite of Light thing.
But the way they treated Hikari in the final battle pissed me off. She stood up to freaking Myotismon before, she was ready to die to save her family and friends. Gatomon lost her best friend to him. Yet Gatomon says almost nothing after identifying the voice as Myotismons and Hikari (and Takeru who had faced darker beings as well) were 'frozen in fear'.
That will never stop pissing me off whenever I think about it. I like 02 (which I usually mention in these discussions) but man, some of the stuff they did annoyed me so much. Even more so now that I've watched the whole series in both EN and JP.
Lack of Character development, the way some characters were treated, the dropped plot points or character flaws, etc.
Annoys me so much. Hope Tris writer is good/consistent at least.
Yeah I get the whole dark-light thing, but they did a dumb job with it.
Considering other characters, it was annoying when Takeru got random pissed off. The way they did it with him was just so.... random and out of character. Not much of a build up either.
02... it was still enjoyable as a watch thru subbed but geeze still many annoying stuff. The scanning of the "bar code" of the dark seed still bothers me, too.