i really love all the ppl on this forum talking about naxx, you guys have zero clue how difficult it will be for 99% of guilds. you are comparing it to 1.12 MC, naxx was tuned for 1.12 (mostly). yes, top top guilds will clear it day 1. top guilds clear it day 2 (~8 hrs of raiding). past that, everyone will struggle. gluth, loatheb, patchwerk, 4 horsemen are brutally unforgiving for people who have never done it before.
going into naxx with the mindset “lol naxx ezmode” will lead to your group failing repeatedly