Okay, I'm in a nasty situation. I'm about to receive my master's degree in two months. Also, I am a third author on my advisor's paper, and the paper is completely awful and full of mistakes. Contradicting results not reported etc., it has it all. The thing is, my advisor will take it personally if I give comments that would put him to a bad light in front of the other co-authors. Very probably, he would let his anger to be seen in the evaluation of my master's thesis.
Really, I have no idea what to do. Should I be quiet, hope the paper gets rejected, and then RUN FAST, or just write a long email about every error there is? Which one is less harmful? I really don't want my name on that paper, nor a biased evaluation of my master's thesis.
(For background, my previous advisor left the university about 6 months ago, and then I got this new one. So, I could probably get a letter of recommendation from the previous advisor.)