I know we are all mad but Koeman is actually doing a decent job. He is playing youngsters, making subs at halftime when things are not going well and he significantly improved our running and pressing. Furthermore, he has the authority in the locker room. I can agree that he made some mistakes, like subbing Fati off today but apart from that he has been more than ok.
IMHO players are the ones to blame. Our attack simply isn't delivering. Pre-covid Messi would have scored 3 or 4 goals in the last two games (Juve and Alaves). Our attack needs at least 10 chances to score 1 goal. Furthermore our defense is horrible. Lenglet alone has costed us 6 points, Neto made a huge mistake today and what's even worse Real has the help of VAR.
Koeman requested the signings of Garcia, Depay and Wijnaldum and got none of them. With all that in mind, I suppose we can agree that he is doing a good job. If our main players start to deliver things should improve significantly.