I see where you're coming from, but how many hammerings do we have to excuse in his evaluation period?
I think that if over time, like Ralf, does not attempt to change players to fit his system/instructions, it will be fair to doubt his ability as a manager. That period of length is up to every individual on this forum. I just thought it would be longer than 2 matches.
I always thought I had a short leash on managers as I wanted our past managers sacked after year 1 most of the time. But I feel like I have stuck to my guns in that I want a manager that can implement a pressing style, and have the side playing with patterns of play in both transition and against low blocks.
I'm not as hard pressed against results so long as I can see United working towards achieving those foundational aspects to a title winning side. The only time I start to really care about results is when the manager is pragmatic, because all that's left is boring football. At that point that only thing you can give to United fans is results. Because you're just relying on individual talent. Klopp did not have results at first, but you could see his imprint on the team in his first season (not his first full season, but his actual first season).
Ralf abandoned his ideas far too quickly. And all his complaints were never addressed by himself over his tenure. At that point, what are you even giving to us United fans? He's not playing the youth so no hope of development. He's not giving us entertaining football. He's not allowing his team to even learn his system over time. It's nothing, but brutal assessment of the squad.
With Mourinho and Ole, they were reliant on individual talent. There was no system that you could believe would give us future success. The players did not look coached compared to the actual good sides. All they had going for them was top 4 football results, and a challenge for the smaller trophies. United ultimately want to challenge for the biggest trophies and they had clearly shown their limit, therefore there is no point in continuing with them.
With ETH, he at the very least needs to provide United with good entertaining football. It doesn't have to be by match 2. But if by the end of the season we have more than demonstrated, but have sustained a footballing side that presses well and creates many chances with the patterns of play aiding in that, then the final standing of United won't bother me so much as it did with those other managers.
But come on man. It has to be longer than 2 matches for me to really question his ability as a manager. Do I trust the longer sample size of his past 4 seasons with Ajax + United's preseason, or do I trust the 2 match sample size in the PL? At least give him the chance to make the adjustments.
And trust me, I wish he didn't have the confidence that made him believe he can polish McFred, de Gea, Shaw, Dalot, Bruno, Rashford, etc... into a side that doesn't get beat by Brentford 4 goals to nil. But he made that mistake, and it's up to our entire transfer team and himself to work around that initial mistake.