There are six reasons to watch the finale, according to The Telegraph
ONE: At last we find out the Doctor's real name. (Isn't that an invasion of the Privacy Act?)
TWO: We find out the real significance of Clara Oswin Oswald, who keeps popping up throughout space and time, then dying.
First she was a Dalek, then a Victorian
governess-cum-barmaid. Now she’s a modern-day au pair. (My guess is that she is a reincarnation expert.)
THREE: There will be Guest Stars. Alex Kingston as the Doctor’s wise-cracking wife River Song and Richard E Grant
(as Doctor Simeon/The Great Intelligence) both return.
FOUR: New Monsters. Show supremo Steven Moffat said he wanted new monsters for the finale. Hence the
undertaker-like Whisper Men, who are mysterious and almost faceless creatures, who do ... what? (Personally, I reckon he should pick up the Wooden Tops, mysterious and almost faceless creatures from Victorian children's fiction, which terrified me when I found the book in my grandmother's attic.)
FIVE: It's written by Moffat himself.
SIX: It's the Telegraph critic's last fix for six months.