The Kalm flashback is more of something unique to this forum, or at least a thread a few years back.

I think a lot of people rail against the Reptites due to game mechanic change ups. The dungeons in these sections tend to have more guide dang it moments like Reptite Cave where you have to wait around for the Wood Bug enemies to dig holes in the right spots to get that one token treasure, or the fact all the dinosaur enemies have ridiculously high defense until you zap them with lightning. In comparison, the future doesn't feel quite as awful, especially when you consider that a good chunk of it is optional, whereas the Reptite sections are not. I honestly hear more gripes for these sections than any other from CT.

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I think the other one that comes to my mind is the Roxas prologue in KHII. While I agree that it's an abnormally long tutorial section, I feel the narrative its wrapped around keeps it way more interesting. Frankly, between it and KH1's tutorial section, I'll take KHII's if only for the smoother control interface making doing the minigame stuff less frustrating. Yet, honestly I still stand by the fact the Roxas sequence was probably the only truly interesting and well written part of KHII's plot.