Yeah big open areas bring up nightmares of CTF_HelmsDeep. A giant field with a not so epic castle on each side. 3 classes were played demo,sniper,scout. Demo was played for the sticky jumps. I hate open areas,hopefully you're like me and create semi-large areas and have plans to fill up space. Hope you can edit this a bit.
Tip: make a brush of gravel,sand,or something of the sort and turn it into a displacement.Sculpt it so it looks like a pile of your chosen material. Add props to complete the scene e.g.dump-truck