No...there IS reason to get worked up. Stop being an Apple apologist. When I upgrade to a newer version of an OS, I do expect my system's battery life to remain relatively unchanged. Yes, the new OS may contain features that drain the battery a bit more, but by 30 percent or more?!?

Apple should be doing testing before release to understand battery life impact, especially when battery life is a highly-touted feature in Mac laptops.
If this were to happen with Windows 8, I'm sure all of you Apple fanatics out there would criticize MS for doing this.
Regardless, a reduction in 30% is NOT acceptable, especially since ML is more of a minor update. Apple needs to do better testing and tighten up their release criteria.