I’m prepared to believe that the first draft of the script was pretty good, before it got hacked down to fit time & budget constraints. What reached the screen was just a confused mess.
The big problem with the finale is that it’s very hard to care about Trenzalore, the Doctor’s name or Clara’s “secret”, because the series hasn’t done enough to develop any of them. There’s more to a plot arc than just inserting big pointers to it every week. The stuff I’m hearing about it suggests that Moffat hasn’t been able to successfully address any of these problems, other than by piling on more spectacle.