you kind of had to have been expecting too much out of this fight to think it was going to be some kind of spectacular showdown. Kishimoto already put it out there for everybody to know in the beginning of the yr that it was the last one, and with the movie's release date being as close as it is, most ppl like myself knew the manga wasn't going to last any more than 10 chapters after Kaguya's defeat.
Naruto and Sasuke's fight vs. Madara didn't even last for more than 2 chapters, so i can't say i didn't already see it coming when considering how drawn out their fight against Kaguya was.