[Fantomen]

Even if it "warps" the game, I'd say it is wrong to kick out someone who's trying his best, no matter how he plays.

You can go to lengths to make sure the game will be balanced before setup, but once you're in, you're in. All players are entitled to their positions, in game performance don't change that.

Taking over a powerful nation in a matured game is a bit more potentially game breaking. Still, I think the only fair way is to be careful about checking the experience of the sub and making sure he understands the obligation. I can't imagine a situation when I would just throw someone out for playing bad.

Edit: I also think it is unacceptable to publicly lambast a player for being unskilled. A freindly PM would be the way if you want to help out, otherwise keep shut.