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.
It's Easy, so It Sucks: Every song under 10 blocks seems to suffer from this by the fanbase, despite a great deal of them actually being loads of fun.)
Thus this leads to more and more expert only Nintendo Hard custom songs and packs.
It's Hard, so It Sucks: On the other hand, ITG's catering to the top-scoring crowd and abundance of Nintendo Hard charts, coupled with a large majority of ITG discussion being amongst higher-end players, means beginner players easily get intimidated from playing. The design of the Novice mode is probably slightly better than DDR's was at the time, but the Easy and Medium charts were oftentimes bland, at least in the first game.
Harsher in Hindsight: The "We're just getting started!" Splash in the original game. Only one more would be released.
Japanese Players Hate ITG: You would expect that since it's the Spiritual Licensee to DDR and with much harder charts, it would catch on with top-tier Japanese players. It didn't; most Japanese players prefer DDR and its chart style and music. The ITG scene is almost exclusively Western.
800$ BOOM (Both players get the same score on "Liquid Moon" in a tournament's final round, but one player accidentally hits a mine right at the end of the song. The "$800" refers to the difference in prize money.)
Non-Indicative Difficulty: Overall, the Driven course may be harder on Hard than on Normal. However, there is one part near the end of Monolith where, on Hard, there is a steady stream of arrows, and on Normal, there are only off-beat (blue) arrows. Combined with the mods in the course, these arrows are difficult to hit at all, while the stream on Hard is easier to read.
The first game has "Disconnected" for "PARANOiA", "I Think I Like That Sound" for "Drop Out", "Hand of Time" for "Healing Vision", and "Pandemonium" for "Gamelan de Couple" and "Legend of MAX".
The second has "Energizer" for "MAX 300", which even nicks the slow part of "neoMAX", a fan remix of "MAX 300". "Energizer" piles on the references to the MAX series especially thick. It's very likely named as it is due to "Energizer Max" batteries, it has a big jump followed by slow section in the middle (though it's longer and brighter than the slowdown in "The Legend of MAX" - the background video shows a freaking field of flowers), and the first sixteen steps of both the Medium and Hard charts are the same as the Medium chart from "The legend of MAX".
That One Attack: Determinator Single Expert 12. Seventeen arrows per second.
The "fade in" modifier on courses, which makes arrows not appear until they're halfway up the screen. While other modifiers such as "alternate" are worse, those ones are accordingly in courses known for having crazy modifiers and lighter steps. "Fade in", on the other hand, appears casually in a lot of the courses, and mean you have half the reaction time you normally do to hit the arrows.
That One Boss: Where to begin? Of course, any ZiGZaG song is definitely one.
There's also "Disconnected Disco" on Expert Double.
Utopia Single Expert 11. It's okay for the most part, until a third into the song the steps stop making sense for a while. See here
Tell Single Expert 12. It's hated due to the fact it has nearly-impossible to hit jumps.