@Marshmallow:
What if we turn the question around and asked what power you think would be the most fun for a new player?
That’s a hard one… because “fun” usually means involvement… lots to do… but the countries with lots to do are also the biggest impact players… so while something like Germany or Japan might be a lot of fun because there’s “lots to do”, its easy to make a bunch of mistakes that will cost you the game playing one of them… conversely, the US and UK can often be considered fun because of either lots of forces worldwide and/or a big budget to buy things… but once again, to a new player, trying to grasp all the amphibious needs of both the UK and US can make for major mistakes if not handled well. I think the safest countries for new players are either the USSR (just buy infantry and hold on), or the lesser powers (Italy/Anzac, etc)… but then of course, these countries aren’t very fun.
Of course if you’re going to make an omelet, you gotta break some eggs… so toss a new player on something and give it a go.