Lord of the Rings: Conquest DS is (at least for my experiance) a very laggy Dynasty Warriors with Warriors, Archers and Mages. The Giant units are yes Trolls and Ents but take down enough to get a Hero unit to have some fun with.
Unfortiantely, limited to LAN games it seems, unless I've overlooked something. Otherwise, it's just Battlefront, alberly a good attempt honestly.