That felt like a 30 minute episode padded out to 80 minutes... it was soooo boring in parts. So much talking.
And the thing that really frustrated me, was how much emphasis was made on the 3 humans feeling "abandoned" for 10 months, but they were too selfish to even find out what happened to the Doctor all that time. They were wanting the Doctor to show up within an hour of disappearing, and had no interest in hearing about what she had to endure, or for how long (I'm under the impression that it was for decades, based on the scratches on her prison walls and what Captain Jack said when he was rescuing the Doctor (he was in there for 19 years, so she could have been in there years before that)... and they used the TARDIS to travel back in time, but missed it by 10 months). Not a single question or sympathy about her being locked away without any friends or real company for a very very long time... while the 3 humans had each other, and the rest of their friends and family to live with during that 10 months.
So, every time one of her crew confronted her about it, it really annoyed me that the writer(s) were making them appear so selfish and oblivious of what the Doctor had to endure for many months or years.

Saying that (which spoiled a fair bit of the episode for me), the idea of "pure Daleks" hunting down and eradicating impure Daleks was interesting... but as the Doctor pointed out, it seemed it a bit ironic, since they are all mutated creatures. But for me, it is the decades of having the Daleks returning from unusual sources that have resulted in different "races" of Daleks, making it difficult to know what a "pure" Dalek really is... and where did this ship of "SAS" Daleks come from? Or more importantly, have they existed throughout all of those times that the Daleks were said to be totally eradicated?

Meanwhile, this incarnation of the Doctor is definitely more willing to kill than any previous version. I always hated the more recent Doctors being written into situations that required an adversary to be killed off, with the writer knowing that the Doctor can't do it, and has to create a situation that has the Doctor doing something really complicated or bizarre... or resulting in a companion doing the dirty work, making the Doctor seem rather impotent. In the original series, deaths were not a solution. If they occurred to remove the antagonist, it would be an accident, or by their own hand.
I guess it wasn't very realistic to have world-destroying races or individuals being defeated without the Doctor getting his hand's dirty.

Two of the human crew did end up leaving at the end of the episode, and I'm glad one of them was the old guy, as the roles should be by actors who aren't already well known, as it is very distracting, expecting them to behave like their pre-existing character (this old guy is a well known gameshow host, while David Tennant had a year with a red-headed lady (Donna) who is a fairly well known comedian in the UK). In my opinion, if you are already famous, and want to be on Dr Who, it should be a guest role.