No experience of "OtE".
"ME" is built around the THW engine which thinks a great deal of itself, particularly its ability to apply the same mechanics to many periods. It can't. I like it a lot for Colonials, WWII, and Zombie fighting, but, in the Napoleonic period, it lacks much.
I don't think the command structure is credible, I don't care for the way it organizes units, and I am hard put to imagine how you'd build a battle with it. The scenarios in the book suggest as much as they're slightly buffed versions of the same scenarios from "Colonial Adventures".