I disagree. It's not losing the war because of these qualities. It has these qualities because it is fighting a losing battle.
The Imperium doesn't have the luxury of granting human rights or any of the niceties that we, from our position of prosperity, have decided humans should be entitled to.
It claims divine ownership of every human and world in the galaxy and then enforces that claim at every possibility -with lasguns if necessary.
It doesn't do this because the people running it are mustache twirling villains but because to do less would be the end of us all. The harsh realities of the universe have forced men collectively to make unpalatable choices.
I agree that it is evil but its evils are absolutely necessary if some humans are to survive.
I see where you're coming from, but nevertheless I have to disagree. The way I see it, the Imperium loses because of its intolerance and incapability of progress. It is an endless regression and maybe similar to the late Soviet Union or the military-industrial complex in todays USA in that aspect. Its own burocracy and dictatorship has gotten out of control and can't handle the situation at all. A progressive Imperium could simply ally with the Tau, Eldar and even some of the Orks and Necrons. Or it could develop more strong souvereign substates like Ultramar. Or it could try to start to invent new technologies instead of praying for machines to work. The imperium is more backwards than the Orks, since a Mek at least invents something new (even though he doesn't know how it works, just like a techmarine

). But right now the Imperium fights everyone on the outside and everyone inside, no wonder they don't have enough ressources.
I know it's the whole point of
40K that the Imperium is the way it is, but I find it kind of strange when people buy the in-universe propaganda that the Imperium was a viable answer to its threats. For me, most of the problems of the Imperium come from its own failures. You wouldn't start to pray to the chaos gods when you had a good life in the imperium.