Hi Glasswasher,
I'm too taking ATPL and had a few of those bad lessons (still having)
One of the evaluations is the mind preparation, like when things go bad you should not become very hard on yourself, because that will happen in the future on a carrier and you'll have to deal with it.
Just think that when you get to the instrument phase it will be a lot worse
But don't worry too much, it's the normal path and to become a great pilot you'll have to deal with and try to overcome it.
The mistakes you do on one lesson you'll study them to not repeat on the next one. It's also a training technique, to let the students do their mistakes so they can realize what they did!
Nice flights and we'll meet up there one day on a big carrier