Well yeah your correct on the simplified invasion, I'd LOVE to see a more complicated system, but the 1 we have makes it more streamlined, and on a gigantic galaxy it makes the game go a little smoother inbetween planet invasions. Even MoO2 was very similar to this 1, the only diference was there was a race that could use mind control, in effect taking slaves, and didnt even have to take the time to build transports, everything else is like GC2, without inspace ship battles,of course. True that you could build tanks and such, but thats just the same thing as a normal soldier, its just with more stats, and a diferent graphic when fightin.
I mentioned Normandy cuz of wut you were sayin, that the defenders know the territory, and the allies didnt know it would go so well, It may have failed miserably, but a lot of variables came into effect into that invasion, like rommel not being on the front giving orders, hitler not giving orders, and that sort of thing, you know?
Anyways, the lead programmer wich I think is frogboy, correct me if Im wrong, has disagreed with planetary bombardment since, forever, and is NOT planing on incorporating that, just like he also decided to eliminate terror stars, wich I think was a bad move, but not that important since its not even close to being a game breaking thing, in fact, it probably makes the AI use everything it has at their disposal.
And about the capital ships, yeah a heavy fighter can kill a same-or-bigger ship, only if it had better weapons of course, but itll probably die in the fightin, or end up with very low HP, therefore be a target, but you wont see 1 fighter killing a large, huge ship, and those are the real capital ships

I consider the tiny, small ships bigger than planes, but still , only be able to fly inspace, and not inside the atmosphere, I guess your undefended transport has some kind of shuttle inside to deliver the troops to ground fightin like in Battlestar Galactica, or Starship Troopers, so yeah, an undefended planet is easy prey for big cargo ships, just pray the AI doesnt buy 1 tiny ship with little more than 1 atack, or youll loose,
waste ,your 1-3 trillion troops for nothing.
Oh yeah, and about the Ion Canon thingy, I was just using the galactopedia and I saw the Planetary Defense thingy, and it gives you a 25% bonus for defense, and you put that together with the 5% bonus defense, and thats 30% defense right there, maybe youll want to use that on your vulnerable planets, just a thought, I dont know why but I never really use it, I always buy off from my friends the appropiate Soldering bonus techs, or research them myself.
GALACTOPEDIA DOWNLOAD LINK
Monc34