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.
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".