I guess I haven't seen such an extreme case as that yet, but it is pretty crazy that it takes that much to resist a single transport. So much so that it more or less isn't worth trying. I don't bother building any defense any more because it isn't a worthwhile investment.

I don't see it like it was before. When I invade I see a victory or defeat screen immediately. Before there was a planet map and rolls and it worked like the combat viewer did and it looked decent. Is that feature removed or bugged?

I had my first defeat last night. Attacking Earth, I think it had 16 population, 100% approval, 10% defense (I don't recall exactly). I had a 5% chance of victory with a 4 pop transport. The second transport succeeded.

So even though I know it isn't strictly speaking bugged, it seems off-balance.