I would say the Iron Man figs are a lot more complex than this
You are comparing apples and oranges.
Skin tight suits have to replicate the effects of movement and the overall organic flow of lines. That is not comparable to solid parts with sharp, clean lines like Iron Man's armour, however intricate.
Green Lantern's costume is essentially painted on. To replicate it you have to have to colour or coat a seamless body and then avoid any deterioration of cracking in the paint/coating. Good luck with that.