Subversion: Use it or Lose it

I hate the fact that version control software exists. Now they are absolutely great for allowing you to revert back to the last stable state of your program. But what if you did something significant, and you were almost at the point where you could fix it? Sometimes we never know that we can fix the problem, or we may be at a crossroads and we have to decide between trying to fix the bugs, or just starting over. So how do you know which to do? Well I would say use the 5 minute rule. If you see errors and you have seen them before, and you have fixed these problems before, I would say do not revert back to the old version. But if it takes you 15 minutes to fix one error and you have at least 4 errors, I would just say revert back to the previous stable version.