That escalated quickly, as they say. I go with elaborate test/are you worthy simulation. How could they let that kid just run around like that. Otherwise there's no going back to the lighthearted hijinks and yuks, it's a full-on doomfest which I think is too great of a change in the basic nature of the show. The tone already changes too abruptly but this would be too much.
If it's real though and they are Daleks after all I assume they will be saved by a change of heart Isaac who will engage some kind of species-wide OFF switch to deactivate the lot of them.
He may get left over as the only one of his species, since he has a heart Tin Man style, if they want to continue with the implausible Claire romance. I don't get what she sees in him at all, plot convenience only I guess, and could really do without the kids.
Other notes, it's funny that the units talk to each other and seem to have data-entry jobs, using their hands tapping on that wall. Such physical activity is silly, all that would be done internally. Doesn't come off as so advanced! Again, semi-comical, like Daleks confronted with stairs.
Gordon saying boy we are a long way from home, arriving like two seconds after they left, I thought was a joke. And, why did they not just send down a shuttle?