Deanzo

The core gameplay of this modpack is mostly gregtech with many different automation challenges which become increasingly complex but with increasingly better logistical tools to keep it manageable. Not only do progression steps into new technological ages feel significant, as you get way stronger. It actually feels like you actually earn every new advancement with the solutions you thought of and created.

GTNH is probably the most developed modpack ever made, sharing the title of "The hardest modpack in minecraft" with some other modpacks. Yet this description depends completely on how you define hardest. Depending on your experience with modded minecraft this modpack can take some learning. Some people feel they are "bad" at this modpack after playing 10 hours, but I would recommend seeing it not as something you inherently suck at but as a skill which you can train and become better at, it is incredible what you can accomplish after learning the smaller steps in a process and combining them together.
However complex this modpack is there is a questbook explaining everything you could want, many GTNH specific youtube tutorials on more complicated gregtech mechanics and even a discord server where any question gets answered. As such I do not believe this to be hardest modpack as long as you are willing to seek out the information required to beat it.

This modpack takes an enormous amount of time to complete as such your goal shouldn't be to complete it but rather enjoy the journey it takes you on.

Regarding the experience of this modpack I would say it is incredible and would recommend anyone and everyone to try it just to figure out if it is something you would like.

A common complaint from newcomers is that the Minecraft version is 1.7.10, I would however state that this is not an issue when actually playing the modpack, modern features are backported with the et futurum requiem mod. Your framerate is higher then in modern version because of the many modpack specific optimizations made over the last 10 years of development. If the textures bother you download the Modernity texture pack for GTNH(easily found on google).

All in all I would recommend people do not dismiss this modpack because of how this modpack is portayed by some people.

Explanation for my star ratings:

Gameplay: This modpack might not be for you, however if it is for you this modpack is more polished, rewarding, and expansive then any other modpack out there. Just trust me on this and play it.

Performance: probably the best running modpack ever, obviously some skyblock modpacks will have higher framerates due to there being no blocks. This modpack has the fastest chunk loading and highest framerate I have ever seen in a modpack after playing over 50 of them over the course of around 3000 hours. This is mostly because there are multiple developer optimizing this modpack specifically for the last 10 years.

Aesthetics: The easthetics is 4.0 since there isnt a specific theme which would make this a 5.0 and also some of the 1.7.10 shaders can feel outdated compared to some specialized modern ones. The realistic shader options are however pretty descent for this version. There are however multiple modpack specific texture packs which bump this rating up a bit(like modernity, or uu-tex, and a couple others).