From: Penrith, Australia
And conversely, who do you rarely, if ever, refuse/dislike playing as?
After reading the piece on Jewish wargaming, I understood where they were coming from when some of them said "I don't feel comfortable playing as the Germans"...well, you wouldn't, would you?
When I play wargames, I usually have certain nations I prefer starting as;
WW2: Commonwealth nations are usually at the top of my play list. US usually at the bottom, mainly because the US is rarely, if ever, in danger. There is no real tension for a US player in that regard, and the knowledge that losses can be made up without having their capital/nation in mortal danger from such a loss leaves me a little cold when playing them in strategy games. I don't mind playing them in tactical games though.
Modern conflicts: again, usually Commonwealth at the top, good quality forces, but never enough of them. Makes a game tense but (usually) winnable through good use of assets. US again at the bottom; how can they lose? Seriously? Only through political will after a long conflict, and that only because they don't turn enemy nations into parking lots. Kills the buzz for me.
WW1: I actually enjoy just about anyone in a decent WW1 game. They all have the capacity to do well, or equally, do terribly. Nobody is a sure winner (or should be the case) in a WW1 game.
Pre 20th century: Depends on the setup. I don't have a lot of likes/dislikes or preconceived loyalties here, so just about anyone will do with the possible exception of; England over France, English over Northmen (Viking era games).
So I guess I am fairly easy to please. Make me a decent wargame with a good setup and I will come. I cannot think of anyone I wouldn't play as. There are a few times where I will pick a certain side over another, but this doesn't rule them out during later games.