I don't know. Perhaps its the years of heavy play but I'm very comfortable with thief 2 movement. I prefer it over Darkmod and most games. New_mantle rocks tho.
Compared to Darkmod it takes more skill to master movement and I like that very much, though everyone that had to sprint circle jump into mantle with old_mantle knows there's a limit to the madness, especially when it starts to break immersion. But still...
Godbreaker to me looked amazing and actually loved the rooftops unfortunately It didn't go well with my play style. Hope that Taffer makes more