The reality is ETH overperformed last season, I don't think that many people expected (albeit hoped) a return to the Champions League and win a trophy in his first season.
Last season we started to see patterns of play, an identity about what we may see going forward and he dealt with Ronaldo in a decisive way. Transfer wise, the Antony transfer was a disaster but Casemiro, Eriksen and Martinez did pretty well.
When you look at this season, the results and utterly shambolic CL performance stand out for sure, but for me it's the fact we seem to have no real pattern of play anymore, no identity and worse over, he's never tried something different. Yes Mainoo has come in but he's stuck to the same formula, the same players (I appreciate we've had a lot of injuries) when he could have given others a chance. If things are failing and you don't change it, it's going to carry on failing. Add to that he's spent a fortune on players that haven't improved us and I don't see how he can carry on being backed. He has to go or I see continued regression.