I'm not trying to flame you in ANY way, but why the hell would they want to do that?
Mass Effect was a great game, sure, but that doen't meant Obsidian can't do their own greatness. And I HATED Mass Effect on my PC. Seems to me that Mass Effect was exclusively desingned with console gamers in mind.
Better off doing something different for K3, if you ask me.
I think you are quite right, Obsidian can most likely do a better job with the combat than ME. I still don't think ME's combat was bad though. Also, I have never played ME on PC so I wouldn't know.
GoW did seem more fun in combat - true.
I probably just said ME because it is an RPG and because of the dials (Feats etc.) - but anyway, I still hope that the devs of Kotor III will incorporate a duck and cover system like GoW.