Frankly, with a farewell speech to an unconscious 'non-listener',  Bill had the worst companion departure of all...and every 'NuWho' companion departure has blown galactic chunks.

This was worse than 'leaving Rose behind a barrier', or 'locking Amy and Rory in a room', or 'wiping Donna's memory for her own good', and even worse than 'Martha joining Torchwood, never actually shown working for them, and never being mentioned because Freema went to  'Law and Order UK'.This even surpasses the dumbest 'companion farewell' in the history of the classic series. Yes, Bill's lame goodbye was on the juvenile level of  1966's 'The War Machines', with 'Dodo has decided to stay in London, and she sends her love.' 

Why is Moffatt so obsessed with denying the Doctor an opportunity to just say 'goodbye' to a companion? 'Not allowed to remember' Clara, and now...whatever this is?

Even then the presence of just about any companion aside from Catherine Tate would be enough to tip the scales towards tolerating the occasional Cyber-conversion. 

... and even worse than 'Martha joining Torchwood, never actually shown working for them, and never being mentioned because Freema went to  'Law and Order UK'.

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IIRC when Martha left se was recommended to join UNIT, who we saw her operating for in the next series. Whilst there had been an intent for her to join Torchwood, I'm not sure this was ever explicitly mentioned in DW although she did appear in some Torchwood episodes and an audio play.

According to Russell Davies' book 'The Writer's Tale', there were several other appearances that were scrapped after Freema moved on(one of those episodes 'replaced' Martha with the Brigadier).

My feeling is,if you`re going to introduce a new
companion just to turn her into a Cyberman,at least give
us time to get attached to her,then have the balls to
make it permanent.

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Agree on both counts.

It frustrates me when a character is introduced only to be changed. It happens a lot in films with little time to establish someone before we are then required to have empathy with them.

And the saving of Bill (into a water sprite or some such nonsense) robbed us of the ending that had clearly been set up over two episodes.

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David Bradley sold me on him being William Hartnell during the An Adventures in Space and Time special that BBC did a few years ago.

I liked the transition from Hartnell to Bradley, black
and white to colour.

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I agree it is a nice touch - indeed, it's a good looking trailer. What could possibly go wrong ...