The MP in QW:ET is ok, but from the time I've spent with it, there's not alot of teamwork. People just run off and do their own thing, and I got bored with it alittle too quickly. Things like turrets and that sort are limited to defense, as you can only place them in held territory, I didn't like that. Fun for awhile, then it gets repetitive, that was my experience.
Never played overlords MP, so I wouldn't know.