LVG and Mourinho were very much not at their peak, and neither Moyes nor Ole could possibly be considered the best in class at their peak, actually ETH is the only manager post SAF you could actually point to and say we went for one of the hottest properties in terms of a manager.
The issue I have with your opinion (which I understand and to which your are of course entitled), is that yes the results have not been good enough, you can point at bad stats and yes that is disappointing, but for me the biggest issue is the performance level, in his first season after the terrible start ETH reverted to an improved version of Ole-ball, and we had some good games, but the last 10 games of that season were a struggle, and the final v NU was awful barring the goals, the second season I could point to a couple or three decent performances (including the fa cup), this season we see no improvement in any department, the system that ETH persists with is just not working and hasn't been working since he came, the only time we do anything is when he reverts to Ole-ball, and yet despite the obvious flaws in the system being obvious to everyone and having them pointed out publicly you can guarantee that v Brentford at the weekend we will see the same shite again.
So my issue is, and why I want ETH to be replaced ASAP is there is zero progress, in fact we are generally worse than when we fired Ole, at least under Ole I could not see us finishing 8th and potentially lower with a negative goal difference 2 seasons running, (don't get me wrong I am not saying that we should have Ole as our manager), ETH is making us actively worse, this squad is easily capable of pushing top 4 but ETH has us playing like bottom 4, and I am fed up of hearing trust the process when after all this time we can see there is nothing to show from it.