Was Katya a scientist?
When Katya does her Europa walk, she spends a lot of time just admiring the landscape. But we knew how limited in time she was. She kept being amazed by a light while she was told to come back. Then she went further away to see the stupid lights. The ice cracked and she dies. Ok, we all know that the ice cracked because there was some alien life, but why did she has to go towards the light? Why did she have to be so slow? She could have hit an area where the ice was too thin anyway; she should have stayed where it was safe. Basically, she did everything she could so she could die. And what's with the constant close-ups on her face? It's an obvious attempt at saving on the budget, and it's annoying. Why would a helmet camera point at her face, and not at what she's seeing.
In the end, what did having humans on board accomplish that sending a probe like Curiosity wouldn't have done? If our mission was simply to say "we did it", we could probably, right now, design such a poor mission, assuming the astronauts need little protection against radiation, and that they don't need to come back. Of course, that wouldn't be passed by the ethical committees.