The spectacle was great, and there's nothing wrong with that.
The problem they have is that they've carefully built the characters and their machinations, and now they're killing them off without giving any meaning to the deaths. Varys could have been done away with at any time over the last five years for that. Having played the game from behind the scenes with expertise he suddenly went "bollocks to it, I don't care who knows". Not really.
Same with the twins. It lacked having a meaning in the face of what had gone on for seven and a half seasons, while Daenarys has spent all that time being the liberator and chosen one, and turned into Saddam Hussein inside five minutes after a dragon and a handmaiden got the chop.
It's still not awful by any stretch. It's still fine TV. But it can't help but feel that about four of the previous seasons could have been chopped out at this kind of pace. It's been a game of chess for years and has suddenly morphed into Aussie Rules football.