Where's Slayven to point out that Kang isn't that imposing in the comics, he's more like a chronic fuckup who runs back into the timestream whenever someone pushes back slightly. Those first times he basically gives up immediately on an elaborate multi-century scheme because the heroes tell him to FFFFFUUUUCCCK OOOOOFFFFOOOOOFFFFFF and so he does.
Kang's "imposing" because he's basically (maybe literally) Doctor Doom with thousands of years of prep time. But since the beginning this is also why he's not at all, he always goes "ha, jokes on you, I can just fuck off into the timestream and come back when things will actually work" so it's like, whatever dude, see you again. The MCU doing him as a multiverse villain is kinda stupid because when they introduce Doom in Fantastic Four and the Kang in Ant Man 3 and the Kang in Loki and whichever Kang is the "big bad" are all going to be separate dudes or something. But then this is the same franchise that did stupid time travel shit to beat Thanos.