@CWO:
The rulebooks in some of the early A&A games (I can’t remember which ones off the top of my head) included brief descriptions of each power’s strengths and weaknesses and of its general situation, followed by statement like “If you’re the kind of player who prefers such-and-such a thing, consider playing this country.” Those were handy to new players, and they were a bit along the lines of what EvenkiNatlOkrug says about his own system for helping players decide which power fits their particular style.
If my memory serves, Larry’s summation about Germany was: “If you want to be the center of attention, consider playing Germany.” :-)
Yep, this is actually where I got the idea. It’s in the rulebook from Revised. I’m not sure about all of them, but if you wanted a balanced game, you should play UK and if you wanted a big land war, you should play USSR.