I'm not sure. It is quite stable, from a crashing point of view, but prediction is still buggy and is what most people notice first when they play. Map features that don't work, corpse problems, stuttering players, players appearing out from behind walls, etc. I think we need to stamp those problems out as much as possible before calling the codebase 'stable'.
denis mentioned that we need tools of some sort in order to fix prediction. What sort of tools, denis? How would we go about getting or making them?