The problem is Seawied...the kind of maps you are describing don't really exist in CRPG. The scale isn't large enough. If they did you'd have woodland, flat land, hills and towns all in the same map with enough space to manoeuvre
That's why I'm arguing for a bit more map variation. I'm not saying make every map open plains. So I think it's a perfectly reasonable request.
Open plains aren't cav fests with an organised team (which is easy enough to achieve). As I stated before, there weren't really any players with outstanding scores (like you get on every hack and slash map with 1 person mowing through everyone). It was all very equal. To me that says that something is going right. There were some good players in cav, infantry and archery on there as well.
And considering tons of pubby players were saying how good it was to have a battle like that when it was going on, I'd say it would be good for cRPG.