I've got nothing wrong with the way you rate it. Because you're an opposition fan that views our transfers objectively.
It's a running theme on this forum that everyone else's transfers are amazing while ours are shite. It doesn't exist on any other place of discussion surrounding United, for example on reddit where you get a more balanced view. There is also a massive level of paranoia/obsession with Liverpool on this forum. There are quite a few that are trying to will Liverpool to be as good as possible as some sort of jinx or admiration.
If Liverpool got Oblak their back line would be massively upgraded. He is a ridiculously good shot stopper and has great distribution, one of the best in the world. Allisson is a 2nd tier goalkeeper, has some promising attributes as a sweeper keeper, and the potential to be a fantastic keeper. The Ederson comparison is irrelevant because he is effectively an outfield player for City due the system he plays in, City dominate the ball far more than Liverpool and Ederson is like a deep lying playmaker for them that does a job in goal.