Against the AI, a PBEM about 12 years ago, and face to face, in one form or another. In fact, when playing France I feel almost resigned to losing Napoleon at some point in time...
I played one face to face game as France where I lost Napoleon, Davout and Soult. Massena and 6 Corps can be a beast if you get lucky. I lost, but only by a little. Made Chit picking easy...
IMHO, a secret (from the old board games) was;
a) Combined Armies under (AS) Charles 446, (PR) Blucher 345 and (RU) Kutusov 344 leader (and GB Wellington 553 if you can convince the British to risk their precious redcoats)
ie. Charles with 2 Austrian, 2 Prussian and 2 Russian Corps (or any combination you can think of and swing politically....)
NOTE: 2 Corps = 1 PP loss EACH when you lose in the example above; up to 3 PP WON >>> EACH <<< if you win...) (IMHO, 1 loss for 3 won is VERY good old EiA PP math)
The problem is, 6 corps straight up against 6 French Corps is almost a losing proposition. Your relying on outpicking your opponent, and relying on die rolls.
Consider this French stack:
1-4 Inf Corps.
Thats 6 Corps. 12 Arty factors, 20 Guard, 85 Inf, and 15 Cav if I recall. Morale is like 4.15. And Napoleon isn;t taking any Minus for tactical, he remains a 5. And you have enough cav that you'll never be outnumbered unless your facing a huge stack.
And that still Leaves other good commanders like Davout and Massena with some decent medium sized stacks of their own. There isn't a 6 Corp allied stack that comes close to replicating this...well, maybe a full Prussian stack, if Charles were commanding...
NOTE: The French HATE short wars....there is not enough PP in it for them...but 2 battles and he WINS up to 8 PP.....plus the surrenders....
I LOVE a short war if I am France. It means I either own quickly and can keep building, or I lost quickly and can rebuild in mostly peace.
COMMENT2: Super stacks where one of the few ways (IMHO) that the Allies could really inflict REAL DAMANGE to the French Army (in terms of numbers) in the beginning of the game and then use their three ecomomies and Brit money to keep the French in any way manageable.......
Which is why when playing France you do what you can to keep them all apart...