VH expect:

enemy
Sniper cannons: first round always hits
Uber militia: were utterly destroying my elite guard units in a one on one gun duel.
Enemy infantry can frontal assault artillery without losing much men.
Cavalry: ignore my infantry to attack my artillery and a re bale to pass through several ranks unharmed.

My army
My cannons can't even hit a building except when parked right in front of it at close range. Cannister shot will often be aimed at the sky for better results ! (although I have seen one volley were a enemy unit was hit and lost 80 percent of its strength).

The enemy gets some bonus. This results in very heavy losses during mêlée, even when defending a fortress. My very good English line infantry were losing lots of men while defending the walls. I hope that the next patch will do something about that bonus and will make the mêlée fights more realistic.