@cenator01:
I think this depends on how many new player you have.
If there are 3 veterans and only one new player, give him USSR.
If there are more newbies than veterans, then let them choose, but maybe dont go 150%.
To my experience:
DON’T TELL THEM WHAT TO DO! Give them an overview of their possibilities and goals (USSR: survive, UK: harass Italy, Germany and Japan, US: Go by force, and finish them off)
Its easier for new players to play the allies, because of their very clear objectives (Do not loose), whereas the Axis have to figure out a way to win. Much more preparations have to be taken, to get you on the win. Its much easier to loose for the axis, due to stupid mistakes.
the national objectives are handy guide aswell…