In general, the raid seems both bland and mercenary. That said, I am struggling to come up with a .1 raid people loved - maybe Ulduar? That was a loooooong time ago.
There's not a lot that's mechanically new or interesting, and reusing the zone we've been doing dailies / questlines in for half the fights feels cheap. At least the Gallagio is visually novel once you get there.
But as a completionist, limiting the raid rep to 1 level per week is what annoys me the most. Blizzard is going to get their 5 months of subs and you are going to burn your hours there, even if you were bored of it after week three, goddammit.
Honestly, that subscription stretch rears its head outside the raid too. Limiting the four cartels (Darkfuse doesn't count) to, what, 6k rep a week, limiting your account to one cartel a week, and having paragon bag rewards is a level of sub-stretching we haven't seen since Shadowlands Covenants.