Do i really need to spell out the reasons?
Getting beaten by RM and even the score line is no surprise to me and shouldn't be to anyone, except probably Faz. They have a much much better team and i don't think that we need to call for Rodgers' head after this game.
However, looking at the way we are playing, especially regarding goals conceded since his arrival, I have no confidence that we will win anything with him at the helm. I think that it is fair to start looking at plan B, ie a proven manager who has won things and who would be available and definitely not take chances with rookies again. There are not many i can think of. Simeone and Klopp come to my mind and i am impressed with Koeman but the latter still needs to confirm over at least a full season. That said, if we are struggling to be in top 4 by Dec, we will need to make a change end of the year.