It literally took me an hour and was super frustrating just to figure it out how to view my enemy's manpower in their star system. As far as I know, there is no clear and easy way to see enemy's manpower anywhere. The only way is you have to zoom out from that system and hover over a human icon above it. It shouldn't be hidden away like that and should be much more easier to find.

Also manpower scale is super misread. My fleet has 110 manpower but when I invade, I only have like ~40 infantries. Why don't you scale it to equal to one infantry? Why? Why 1 manpower equal to ~0.3 infantry? That doesn't make much sense! It should be 1 manpower equal to one 1 infantry and tank or jet could be like 10 or 100 power of infantry or something.