I have a first hand experience in using Subversion for game development and
that was for versioning data not code.
The Witcher game used SVN during its development. The working directory was
20+ GB in size and the whole repository was 200+ GB in size when the game
I have to admit that SVN handled this quite well although the performance was
the biggest problem. 50+ people updating 50K+ files every morning took some
time. Many hours wasted just to finally update a few hundred files. Also many
gigabytes of local space wasted by local copies of each file only needed in
case of revert operation (which could be done from the server anyway).