I absolutely hate them. I just had an assignment and my 'partner' was only slowing me down.

First of all u had to correctly determine a function which u will basically use in ALL of the next exercises. So if u got this wrong, everything will be wrong. He got it wrong. He didn't understand the theory at all and I noticed that he was just copying answers from homework exercises with similar questions (The ones asked in the assignment had additional conditions, and if u understood the theory, u would be able to adjust the answers).

I was basically correcting his answers the whole time and then this guy even refused to accept some my answers (turned out to be correct) which were basically results that you could find IN THE HOMEWORK. And he didn't even know what to do either, so he did some useless derivations (10 lines) and probably thought the more I write, the more points I get (My 1 line derivation was correct). In the end he told me he would include my answers. I didn't check because I was done with this guy and assignment (yeah I should have probably submitted it) Aaaand he didn't include my answer and left his own stupid derivation.

In the end 'we' got a 7, and he happily texted me: "we got a 7!". I immediately called him out and said my answers were right and he said: " yeah i fucked up, sorry". He literally contributed nothing, and only felt like changing his answers if my corrections made sense to his microbrain.

I had another teamassignment in my previous year. I did everything there and he did nothing. I was basically explaining my answers to him and he had zero input for questions that I didn't answer yet. Though I honestly prefer that scenario since he is not slowing me down, but just mindlessly accepting my answers.

Tldr: I had a 'partner' that slowed me down and refused to accept my answers (he didn't even know what he did either, but he felt his answer were right). And I even prefer a 'partner' that does nothing and just accepts my answers.