The latest Patch 1.03A from Blizzard has fixed several issues, like the zombie bear and how much punishment your armor can take. For the zombie now you can go zombie path finding and more improvement on the armor allow you to last longer. I was getting tire that I would just be dying for a small hit now this has improved. Also don't forget to check out our Diablo 3 Walkthrough for any hints.
Here is a important note from Blizzard about the fixes:
Important: Please note that you will not be prompted to download patch 1.0.3a until the patch is live in your home region. If you are logging in from a European or Asian client, you will need to wait for this patch to release in that region before it can be installed. Additionally, if your home region is the Americas, you will be unable to log into Europe or Asia using Global Play after patch 1.0.3a is live until those regions have also patched.