I found it somewhat forgettable too.
Forgettable is not how I would describe it. It's a rare movie that can actually trivialize the Nazis. Wes Anderson has crawled so far up his own ass that he has forgotten that an actual world exists outside of his created worlds, but not in a cool fantasy way, in more of a denialist way. I can't stand it, I don't think.
Yes, I get that. I'm really struggling to remember very much about it, hence the "forgettable" comment. Regarding trivializing the Nazis... what did you think of "Life is Beautiful" (1997) A lot of people thought Benigni trivialized concentration camps . . . I liked it though. I'm not sure the Grand Budapest had a point. Maybe when the others get around to seeing it, they can enlighten me.