ExploderWizard
Hero
Which basically reinforces my point that in a DnD game, odds are very rarely that bad. Which means that typically PC's will win the majority of encounters.
I would say that in an interesting D&D game, the winning of encounters isn't an automated process in either direction. Winning or losing will be determined by the decisions made during play which include when or IF 'an encounter' will be faced at all. Win and loss percentages by the numbers are of course more important when encounters are served conveyor-belt style and must be dealt with as they come. It is far simpler in that case to just load all the numbers into a simulator and see what happens.