I enjoyed it, but I am worried that they are watering down Capaldis Doctor, which if they do shows a real lack of nerve, I mean come on have some guts and stick by your intention of bringing a different take on The Doctor to what we have seen with the two previous ones, this mini felt like it was a echo of Matts time, are they really going to let some criticism (which they knew would be coming anyway when doing a shake-up) effect them and make them go running back to the old tried (and tired) ways, have some backbone.
The Doctor at the beginning of series 8 was brilliant and a great refreshing contrast to MS and DT Doctors, stick with it and head forward don't regress backward that just leads to staleness and eventual disinterest (its what happened in part to 80's DW).
But its just a prequel where the tone could be different from the main series, I hope the main series proves my concern wrong.