I'm not skillful enough for MP yet, but I think I'll have the chance soon.

As for the reason choosing the Agincourt map, my opinion is the same with you, VKC_Blutzeit. Most of the terrain is plain but there woods for cover so the cavalry should have a chance. I've avoided maps with many hills as that would let the defender's missiles and artillaries have an unfair advantage.

My main strategy is to avoid loss(Byz elite units are expensive) at all cost so I perfer long distance firepower, usually 40% of my army is missile troops.