If it wasn't accompanied with such great expectations it might have made my list, fair or unfair.
I half expected the Sigur Rˇs album to not be as good as their others given their hiatus and (intentional) change in approach. Jonsi as much as said they didn't intend to follow up Me su Ý eyrum vi spilum endalaust, and that Valtari was something they "needed to get out of their systems."
But I really thought Alcest would follow ╔cailles with something very similar in structure and approach, especially since they started on it so quickly after ╔cailles was released. I think they did try to follow it up, and forced too much and just did a really bad job.