In the first game I played the British. The rules were seemed okay at first, but infantry tended to hang back and slug away with musketry and never attempt to close. This was probably because we had all shooting actions as automatic successes, supposedly offset by units in column getting automatic movement activations.
We also tried a "supporting unit" role wherein all units within 6" of unit taking a morale test received +1 per supporting unit. This led to the somewhat silly endgame where the British had five units still on the table but all of them had taken around 50% or more casualties yet were still unwavering!
In the post-game discussion the verdict was that to adapt the Lion Rampant system to the Napoleonic period, you had to add on so many rules that you might as well just play Black Powder!