DTV maps are mostly... fine? I think. Long time ago Spanky Ham re-did a whole lot of them with help of a few other guys, I think not all made it into the rotation but few could be changed out, for example Mines of Moria, MAAAYBE Helm's Deep Rohan, not sure about the others.
Off the top of my head, maps that should stay in DTV rotation are:
Spanky Ham Istiniar (no unreachable places, no fences making it a tiny labyrinth, good open map)
Spanky Ham Yaragar (again, no unreachable stuff, one of the best DTV maps)
Thranduil's Motte and Bailey (?), the map with the wooden fort that goes down into a wide courtyard, enemies spawn outside
Generally the balance is good when there are both good defensible positions near the Virgin and some free area outside for cavalry to work.
Here, somewhere in the thread there are a couple old but reworked maps done by Spanky, together with all the files needed.