I do think those comments about them getting there too fast are a little unfair. We didn't see the whole of their time during the first few loops, and they probably stood about doing nothing much during a lot of them. They all became more focused later (dying would do that for you) and familiar with the layout. I would agree that they did seem to get around very quickly in one particular loop (3rd to last??) but I've only watched it the once and I forgot to use my stopwatch. On the whole, I'd still maintain that this story was well written. It's easy to criticise Doctor Who recently, because it has had some stories that were real clangers, so I do think we should give some credit where it's due. If anything here was to be criticised then the 'time loop doesn't apply to the door in the basement' was the most convenient thing, but otherwise they'd never have escaped.
I did stop watching Doctor Who for a while when I got too annoyed with the poor stories. If people hate it that much then that would be my best advice to them. The best 'nitpicking' of TV programmes and films is really only possible when you actually have a love of the thing you are watching, or at least, when you love to hate them. Otherwise, it just comes over as pure hate. Clearly, from audience figures, many people still love this show, and they must find all the negativity here tiresome. It might be a reason why they never post in this forum.
This isn't the last Whittaker episode. There are to be several 'specials' before she regenerates next autumn. The Sea Devils in China is the next story.