The "enlightening" part would be that you can do a similar search for essentially any iOS update (and in particular x.0 updates), but that doesn't mean there are inherent battery issues in those updates. Just because there are people complaining (as is usually the case with any update, as I mentioned), doesn't mean it represents many people, let alone a majority--and if there was an inherent battery problem with an update it would affect at least the majority or at least pretty much everyone with some particular device or something else in particular, which is rarely the case.